"Painting Of Naval Ordnance Equipment,", NAVORD OSTD 52, 1955, describes the standards for painting of ordnance, choice of coating, etc.

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Richard Pekelney






7 JULY 1955

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Department of Defense, United States of America DEPARTMENT OF THE NAVY

7 July 1955



1. NAVORD OSTD 52 (Twentieth Revision) covers materials, methods, and processes approved for use in the painting of various types of Naval Ordnance Equipment.

2. This publication is intended for use as a general guide in identifying the designations of painting materials and processes shown on drawings and other documents. When so used, reference must be made to the particular paint systems and processes described herein.

3. This publication supersedes all previous editions of NAVORD OSTD 52, which should be destroyed.

Rear Admiral, U. S. Navy
Deputy Chief,
Bureau of Ordnance


Paragraph Page
1. SCOPE 1
  4.1 Cleaning Materials and Processes 1
  4.2 Chemical Treatments and "Pretreatments" 2
  4.3 Primers, Fillers, and Sealers 2
  4.4 Paints (Enamels, Paints, Lacquers, and Varnishes) 2
    4.4.1 Enamels and Paints 2
    4.4.2 Lacquers 3
    4.4.3 Varnishes and Shellacs 3
    4.4.4 Miscellaneous 3
  5.1 General 3
  5.2 Cleaning 3
    5.2.1 Ferrous Metals 3 Pickling 4 Special Cleaning of Interior Surfaces 4
    5.2.2 Non-ferrous Metals 4
    5.2.3 Flux Removal 4
  5.3 Surface Treatments 4
    5.3.1 General 4
    5.3.2 Ferrous Metals 4
    5.3.3 Non-ferrous Metals 4 Aluminum and Aluminum Alloys 4 Magnesium Alloys 4 Cadmium-Plated Surfaces 4 Zinc Alloys and Zinc-coated Steel 5 Copper Alloys 5
  7.1 Shipboard Equipment 8
    7.1.1 Exposed Surfaces 8
    7.1.2 Unexposed Surfaces 8
  7.2 Underwater Equipment 8
  8.1 Atmospheric Conditions 8
  8.2 Conditions of Surfaces 8
  8.3 Paint Thicknesses 9
  8.4 Water Seals and Drainage 9
  8.5 Paying Surfaces 9
    8.5.1 Wood 9
    8.5.2 Similar and Dissimilar Metals 9
    8.5.3 Treatment of Paying Surfaces 9
  8.6 Electric Cables 9
  8.7 Workmanship 10
  8.8 Painting Instructions 10

1. SCOPE.-This standard covers materials, methods, and processes approved for use in the painting of various types of Naval ordnance equipment. The term "painting" is understood to include such preparatory treatments as cleaning, descaling, rust removal, chemical treatment, filling, calking, etc., and the subsequent application of coatings such as pretreatments, primers, and final coats of paint, enamel, varnish, or other protective films.

Painting of certain ammunition items such as projectiles and containers, rockets, and bombs, is not covered herein. For these items, reference should be made to the appropriate publications or drawings, including the following NAVORD specifications:

NAVORD OS 1427- Marking, Painting, and Greasing of Projectiles.
NAVORD OS 3378- Painting and Marking of Rocket Heads and Motors by the Manufacturer of Inert Parts.
NAVORD OS 3405- Painting and Marking of 3" Caliber and Larger Gun Ammunition and Ammunition Components by Loading Activities.
NAVORD OS 3410- Painting and Marking of Gun Ammunition Boxes and Tanks by Loading Activities.
NAVORD OS 3571- Painting and Marking of Rocket Heads and Motors by Loading Activities.
NAVORD OS 6427- Painting and Marking of Jato Units and Guided Missile Boosters and Sustainers.

2. USE OF THIS STANDARD.-This Standard is intended for use as a general guide to the selection of suitable painting materials, systems, and procedures. In designating these on drawings or in specifications or other documents, reference to NAVORD OSTD 52 as a whole should be for general procedures only, e. g., preparation. Specific references in accordance with this standard

  should be given when particular processes, materials, and paint systems are to be used.

3. SURFACES NOT TO BE PAINTED.-Certain types of surfaces do not require painting, or are harmfully affected by painting. These include the following, which should not be painted or otherwise surface treated:

a. Machined surfaces that are required to move with respect to one another, such as threads, slides, bearing contacts, gear teeth, etc. Such surfaces generally are lubricated when in use, but may be protected by readily removable preservatives when stored.

b. Electrical parts already assembled, such as contacts, relays, bearings, insulators, etc. When any of these parts are to be painted, the coating shall be done prior to assembly. When "touch-up" is required, as on machined plastics, the utmost care must be used to avoid any paint residue on surfaces in electrical contact, or whose proper operation may in any way be affected by such residue.

c. Parts of copper or copper alloy, plated or unplated, such as electrical sockets, plugs, connectors, contacts, and terminals. Plastic and rubber insulators, mounts, spacers, etc., used in connection with these items, also shall not be painted, except where "touch-up" on cut ends of plastics is desirable.

d. Lubrication fittings, cups, etc., should not be painted, but adjacent piping or equipment may be color coded for identification.

4. MATERIALS AND PROCESSES.-The following is a list of approved specification materials and processes, classified by types, that are commonly used for surface preparation and painting of ordnance material. This list does not include all of the materials which may, under proper conditions and with prior Bureau of Ordnance approval, be used.

In all cases, the latest issue of a specification is to be used.

4.1 Cleaning Materials and Processes:


O-P-191- Perchlorethylene (Tetrachlorethylene), Technical Grade.
O-T-634- Trichlorethylene, Technical Grade.

P-S-611- Solvent, Dry Cleaning.
TT-R-251- Remover, Paint and Varnish (Organic-Solvent Type).

MIL-C-490-Cleaning and Preparation of Ferrous and Zinc-Coated Surface for Organic Protective coatings. (Grade II-Cleaning Treatments.) MIL-M-7752(Aer)-Metal Cleaner, Silicate Soap.

OS 1158- Cleaning and Protecting Interior Non-machined Surfaces of Castings and Fabrications.
4.2 Chemical Treatments and "Pretreatments":

QQ-P-416- Plating, Cadmium (Electrodeposited).-Types II and III Supplementary Treatments.
QQ-Z-325- Zinc Plating (Electrodeposited). Types II and III Supplementary Treatments.

MIL-C-490- Cleaning and Preparation of Ferrous and Zinc-Coated Metal Surfaces for Organic Protective Coatings. (Grade I-Phosphating).
MIL-F-495- Finishes, Chemical, Black for Copper Alloys.
MIL-M-3171- Magnesium Alloy; Processes for Corrosion Protection of.
MIL-C-5541- Chemical Films for Aluminum and Aluminum Alloys.
MIL-A-8625- Anodic Coatings for Aluminum and Aluminum Alloys.
MIL-C-15328- Coating, Pretreatment (Formula No. 117 for Metals).

4.3 Primers, Fillers, and Sealers:

TT-P-25- Primer, Paint, Exterior (Undercoat for Wood (Ready-Mixed, White and Tints.
TT-F-336- Filler, Wood, Paste.
TT-P-636- Primer Coating, Synthetic, Wood and Ferrous Metal.
TT-P-664- Primer, Coating, Synthetic, Rust Inhibiting, Lacquer-Resisting.
MIL-S-974- Surfacer, Sanding.
MIL-P-2829- Packing Material, Joint-Sealing, (Oil and Water Stop).
MIL-P-6889- Primer, Zinc Chromate, For Aircraft Use.
MIL-C-15202- Cement, Smoothing (Formula No. 62).
MIL-C-15705- Calking Compound (Liquid Polymer Polysulfide Synthetic Rubber, Formula No. 112, For Metal Enclosures).
MIL-P-15930- Primer, Paint, Vinyl-Zinc Chromate Type, Formula No. 120.
MIL-C-16231- Calking Compound (For Metal Seams).

4.4 Paints (Paints, Enamels, Lacquers, and Varnishes):

4.4.1 ENAMELS AND PAINTS.-(The distinction between paints and enamels is no longer distinct. Enamels are paints which contain more or less synthetic or natural resin, as well as drying oils and solid pigments.)


TT-E-485- Enamel (for) Drums and Other Metal Products, Rust-Inhibiting, Olive Drab.
TT-A-489- Enamel, Gloss, Synthetic (For Exterior and Interior Surfaces).
TT-A-468- Aluminum-Pigment; Powder and Paste for Paint. Used with Varnish MIL-V-1174.)


JAN-L-73- Lacquer-Enamel, Lustreless. MIL-E-74-Enamel, Lustreless, Quick-Drying.
JAN-P-450- Paint, Acid-Proof, Black (For Ammunition).
JAN-E-480- Enamel, Baking, Phenol-or Urea Formaldehyde.
JAN-P-702- Paint, Inside, White, Semi-Gloss, Fire-Retardant.
MIL-E-1115- Enamel, White (Formula, 30) (For Naval Shipboard Use).
MIL-P-1264- Paint, Outside, White (Formula No. 6).
MIL-P-1265- Paint, Outside, Ocean Gray, No. 17 (Formula No. 5-0).
MIL-E-5556- Enamel, Camouflage, Quick drying.


MIL-E-10687- Enamel, Lusterless, Quickdrying (For Ammunition).
MIL-E-15090- Enamel, Equipment, Light-Gray (Formula No. 111) (For Naval Shipboard Use).
MIL-P-15130- Paint, Outside, Haze-Gray, No. 27 (Formula No. 511).
MIL-P-15932- Paint, Outside, Gloss-Black, (Vinyl-Alkyd) (Formula No. 122-1.
MIL-P-15933- Paint, Outside, Dull-Black (Vinyl-Alkyd) (Formula No. 122-3).
MIL-P-16189- Paint, Anti-Fouling, Vinyl, Black (Formula No. 219).
Enamel, SemiGloss (For Metal Surfaces of Ammunition and Ammunition Containers).
MIL-P-16738- Paint, Outside, White, Vinyl-Alkyd (Formula No. 122-82).
MIL-P-20087- Paint, Heat Resisting.

4.4.2 LACQUERS.-(Solutions of resins such as cellulose compounds in a solvent, with or without pigments. "Drying" depends only on evaporation of solvent.)


TT-L-31- Lacquer, Cellulose Nitrate, Gloss.


MIL-L-6805-Lacquer, Camouflage.

4.4.3 VARNISHES AND SHELLACS.-(Varnishes are solutions of resins and drying oils in solvents. Shellacs are solutions or dispersions of certain resin in alcohol.)


TT-V-51- Varnish, Asphalt.
TT-V-91- Varnish, Shellac.
TT-V-121- Varnish, Spar, Water-Resisting.


MIL-V-173- Varnish, Moisture and Fungus-Resistant, for the Treatment of Communications, Electronic, and Associated Electrical Equipment.
MIL-V-1137- Varnish, Electrical-Insulating (For Electromotive Equipment).
MIL-V-1174- Varnish, Spar, Water-Resisting (Formula No. 80).
  4.4.4 MISCELLANEOUS.-The following are often referred to in connection with painting, prevention of deterioration, test methods, and related matters:

NAVORD OS 6341- Miscellaneous General Ordnance Requirements.
FEDERAL STANDARD 595- Colors for Paints.
TT-P-141- Paint, Varnish, Lacquer, and Related Materials; Methods of Inspection, Sampling, and Testing.
MIL-C-15159- Compound, Preservative, Fire-, Water-, Mildew-, and Weather-Resistant (For Canvas).


5.1 General.-Before the application of any paint (including primers and pretreatments) surfaces shall be thoroughly clean, dry, and free of oil, grease, dirt, old paint, rust, and mill scale. Surfaces of wood shall be sanded clean and smooth.

5.2 Cleaning:

5.2.1 FERROUS METALS.-Ferrous metal surfaces shall be cleaned by one or more of the methods of Grade II, Specification MIL-C-490. Mechanical cleaning should be used only on items where contamination from the cleaning process will not affect critical surfaces or adjacent parts. Where necessary, old paint shall be removed by use of solvent type paint remover, Specification TT-R-251. All cleaning shall be followed by thorough rinsing to remove residue from solvents, acids, or other chemicals. Details of cleaning and subsequent treatment shall comply with the requirements given in Specification MIL-C-490. Pickling.-When authorized by the drawing or specification of the item being processed, acid pickling may be used to remove mill-scale and rust from surfaces to be painted. The pickling bath shall consist of a 5-percent by volume solution of sulfuric acid (5 gallons of 66 Baume sulfuric acid to 95 gallons of water) maintained at 170-180 degrees F, and inhibited with type B (nonfoaming), Class A (liquid) pickling inhibitor, Specification O-1-501, used in accordance with the manufacturer's directions. After removal of scale as indicated by a uniform


gray color, the item shall be allowed to drain before rinsing. The pickling bath shall be discarded when the iron content reaches 5 percent. The rinsing bath shall consist of fresh circulating water maintained at 170-180 degrees F. Combined concentrations of sulphuric acid and iron sulphates in the rinse shall not exceed 2.0 grams per gallon. The hot water rinse shall be followed by immersion in a rust-inhibiting solution containing one ounce per gallon of sodium dichromate and 3/4 oz/gal of phosphoric acid, 75-percent grade. This solution shall be maintained at 190 to 205 degrees F, and immersion shall be for two to five minutes. Concentrations shall be maintained properly so that the steel removed from the bath has a clean appearance. Surfaces shall be allowed to dry thoroughly and shall be prime-coated as soon as possible thereafter. Special Cleaning of Interior Surfaces.-Interior surfaces of castings and fabrications which are to contain working parts, such as bearings, gears, shafts, etc., or hydraulic fluids, shall be cleaned in accordance with NAVORD OS 1158 to remove all possible sources of contamination.

5.2.2 NON-FERROUS METALS.-Cleaning of non-ferrous metals shall be by means of solvents such as Specification P-S-661, Paint Remover, Specification TT-R-251, or by detergents or cleaners which do not harm the surface, such as metal cleaner, Specification MIL-M-7752(Aer), followed by thorough removal of residues, rinsing, and drying. Strong alkaline cleaners shall not be used on surfaces of aluminum and its alloys, zinc alloys, or zinc coatings. Use of sand-blast, steel wool, or acids for cleaning of non-ferrous metals, ordinarily will not be permitted. However, under properly controlled conditions, certain chemical treatments are permissible for preparing surfaces for painting (see 5.3), and stainless-steel wool may be used on aluminum alloys.

5.2.3 FLUX REMOVAL.-Fluxes used in joining metal of any type shall be removed thoroughly prior to painting. In most cases, thorough cleaning with hot water is sufficient. Rosin residues may be removed with alcohol. Fluxes containing greasy matter should be cleansed with dry cleaning solvent. "Neutralization" of acidic residues is not recommended, since salt residues

  may remain. The final rinse should always be with hot water, followed by thorough drying.

5.3 Surface Treatments:

5.3.1 GENERAL.-Practically all metal surfaces require some type of chemical treatment prior to priming, to secure the best possible adhesion of paints (including primer coats) and also the best resistance to deteriorating influences. The recommended treatments for various metals are given in the following subparagraphs:

5.3.2 FERROUS METALS.-Surfaces of ferrous metals shall be cleaned in accordance with paragraph 5.2.1. Surfaces which are to be painted shall, unless otherwise specified, be phosphated in accordance with Specification MIL-C-490, Grade I. When, for some reason, this treatment is impractical (as on very large surfaces) pretreatment coating in accordance with Specification MIL-C-15328 may be used.

5.3.3 NON-FERROUS METALS. Aluminum and Aluminum Alloys.-Surfaces of aluminum or its alloys shall be anodized where required, in accordance with Specification MIL-A-8625. Chemical treatment, in accordance with Specification MIL-C-5541, may be used as a basis for painting. Magnesium Alloys.-Surfaces of magnesium alloy, when permitted, shall be treated in accordance with Specification MIL-M-3171. Cadmium-Plated Surfaces.-Surfaces of cadmium-plated articles which are to be painted shall be treated in accordance with one of the supplementary treatments (Type II or Type III) of Specification QQ-P-416, or with pretreatment coating, Specification MIL-C-15328. Unpainted cadmium-plated surfaces shall be given a supplementary treatment, Specification QQ-P416, Type II. Zinc Alloys or Zinc-Coated Steel.- Surf aces of zinc alloys or coatings which are to be painted shall be treated in accordance with one of the supplementary treatments (Types II and III) of Specification QQ-Z-325. Surfaces not so treated during manufacture shall be given a pretreatment with Specification MIL-C-15328 material. Unpainted zinc-plated surfaces shall be given a supplementary treatment, Specification QQ-Z-325, Type II.


5 Copper Alloys.-When required, surfaces of copper alloys may be given a black chemical treatment in accordance with Specification MIL-F-495. This type of finish need not be painted, but can serve as a base for paint.

6. BUREAU OF ORDNANCE PAINT SYSTEMS.-Certain paint systems (formerly referred to as paint numbers) have become established as standard for Naval Ordnance use. A paint system is a series of paints including primers, when used, and finish coats, and may consist of several coats. The "systems" are in addition to any cleaning, preparation, and pretreatments required (see paragraph 5). In table 1, the currently approved paint systems are shown, together with the most frequent uses of the systems

  listed (see Index to table 1). Systems which have been discontinued, or replaced by others, are shown in table 2.

The systems and colors indicated in table 1, although approved as "standard", are not to be considered mandatory in all cases. It is expected that those responsible will exercise good judgment in determining when exceptions may be necessary, in accordance with current knowledge, policies, or unusual situations.

Colors of paints shall be in accordance with the requirements of the specification for the paint itself, for the color indicated. Color chips are available from the sources indicated in the individual specifications.

Equipment, Type of Surface or Exposure System No.
Acid resistant surface 5
Armored cable 25
Background (Name plates, cases) 17
Cable, armored 25
Cases, instrument, background 17
Cases, instrument, interior surfaces 13 or 27
Cases, metal 25
Cases, mine, exterior surfaces 46
Cases, mine, interior surfaces 13
Crates, mine 46 or 46A
Depth Charges 2
Electrical parts, sealing or touch-up 42
Equipment in storage or protected 2
Equipment not exposed to weather 37
Flight gear, mines 46
Gun-mount enclosures, interior surfaces 25
Instrument cases, interior surfaces 13, 27, or 30
Instruments, portable 37A
Launchers 10
Metal surfaces exposed to weather 22
Metal surfaces, high reflectance 14
Mines See Nos. 13, 46, 46A, 47, 48
  Anchors 46A
  Bottom and drifting 46
Equipment, Type of Surface or Exposure System No.
  Cases See Nos. 13, 46
  Crates 46 or 46A
  Exterior surfaces 46 or 48
  Floats 48
  Interior surfaces 13
  Moored 48
  Surfaces in contact with explosives 47
Mounts, gun See Nos. 22, 25
Name plates 17
Non-metallic surfaces exposed to weather 22
Optical Instruments:
  Cases 13 or 17
  Exterior surfaces 37 or 37A
  Interior surfaces 7
  Knobs, eye pieces 9
Racks, instrument, mine 46
Sealing or touch-up, electrical parts 42
Surfaces in contact with explosives 47
  Accessories 33 or 36
  Boxes not exposed to weather 33
  Boxes exposed to weather 12
  Interior of wooden cases 30
  Natural finish 31 or 32


Name Primer, Filler, Surfacer 1 Final Paint Coats and Color Uses
Paint and Color No. of Coats
2 Ocean gray MIL-P-6889 or TT-P-664. MIL-P-1265-ocean gray 1 Exterior surfaces of equipment in storage or within shields or turrets; depth charges.
5 Acid-resisting black None BuShips Formula 27 2 Acid-resistant coating.
7 Dull black enamel MIL-P-6889 MIL-E-5556, dull black No. 604. 1 Inside non-bearing surfaces of optical instruments, for minimum reflectance.
9 Semi-gloss black enamel. MIL-A-6889 MIL-E-5556, dull black No. 604. 1 Knobs, eye-pieces, etc., of optical instruments.
MIL-E-16663 (BuOrd), black. 1
10 Heat-resistant paint None MIL-P-20087 2 Launchers, etc., where temperatures are high.
12 Ocean gray for wood TT-P-468, Type II, Class B-1 1/2 lb. to 1 gal. varnish, MIL-V-1174. MIL-P-1265-ocean gray 2 Wooden boxes exposed to weather. (For metal, use System No. 2.)
13 Semi-gloss white MIL-P-6889 JAN-P-702-white 2 Interior surfaces of mine cases (except where in contact with explosives), and instrument cases.
14 Gloss white MIL-P-6889 or TT-P-664. JAN-P-702-white 1 Metal surfaces not exposed to weather, for high light reflectance.
MIL-E-1115-white 1
17 Flat black lacquer MIL-P-6889 MIL-L-6805, black No. 604. 2 or more Background on name plates, cases, etc.
22 Haze gray 2 MIL-P-6889 or TT-P-664 (on metals only). MIL-P-15130-haze gray 2 Metal surfaces exposed to weather; non-metallic surfaces exposed to weather (omit primer).
25 Aluminum paint for metal. MIL-P-6889 or TT-P-664. TT-A-468, Type II, Class B-2 lb. to 1 gal. varnish, MIL-V-1174. 2 Interior of gun-mount enclosures; metal cases; armored cable.

27 White gloss lacquer MIL-P-6889 TT-L-31, white 3 or more Inside of instrument cases, for maximum light.
30 Aluminum paint for wood. None TT-A-468, Type II, Class B-1 1/2 lb. to 1 gal. varnish, MIL-V-1174. 1 Interior of wooden instrument cases.
31 Varnish for wood TT-F-336 filler TT-V-121 varnish 2 Natural wood finish, e.g.,for hardwood boxes.
32 Varnish, rubbed TT-F-336 filler TT-V-121 varnish 2 Natural wood finish, rubbed and polished.
33 Orange shellac None TT-V-91, Type II-4 1/2 lb. per gal. alcohol. 1 or 2 Wooden boxes and accessories.
36 Bleached shellac TT-F-336 filler TT-V-91, Type 1-4 lb. per gal. alcohol. 2 Wooden accessories.
37 Light gray enamel, semi-gloss. MIL-P-6889, and MIL-S-974 if required for smoothing. MIL-E-15090, Class 2-light gray. 2 Equipment not exposed to weather.
37A Light gray enamel-gloss. MIL-P-6889, and MIL-S-974 if required for smoothing. MIL-E-15090, Class 1-light gray; 2 Portable instruments.
42 Electrical insulating varnish. None MIL-V-173 or MIL-V- 1137 varnish. 1 Sealing or touch-up on electrical parts.
46 Olive drab MIL-P-6889 MIL-E-10687, Olive drab. 2 Exterior surfaces of bottom and drifting mines, mine cases, crates, flight-gear, instrument racks, etc.
46A Black, lustreless MIL-P-6889 MIL-E-10687, black 2 Mine anchors and crates.
47 Acid-proof black None JAN-P-450-black 1 Interior surfaces of mines, etc., in contact with explosives.
48 Anti-fouling paint. MIL-C-15328 (one coat). MIL-P-16189-dark 2 or more to 4 mil min. Exterior surfaces of moored mines and floats.
MIL-P-15930 (four coats to 4 mil. min. thickness).
---- MIL-P-16738-white ---- Marking mines.3

1 One coat each, except where otherwise noted.
2 System No. 22 replaces the former ocean gray for exposed surfaces on shipboard.
3 Items coated with this system shall be marked "COATED WITH VINYL ANTI-FOULING SYSTEM".


Table 2


Discontinued, or Replaced by System Number
1 2
3 2
4 See paragraph 8.5.3.
6 Discontinued.
81 9 (black) or 37 (gray).
11 Specification TT-P-25 primer for wood.
15 17
16 17
18 Primer MIL-P-6889 or TT-P-664.
19 See paragraph 1 for painting ammunition.
20 17
21 22
23 No. 2 for metals, No. 12 for wood.
24 25
26 25
28 22 or 37 (See table 1).
29 37
34 36
35 36
38 Primer, Specification TT-P-25.
39 Use system 46A or 48, as applicable.
40 See paragraph 1 for painting ammunition.
41 MIL-C-15159 preservative for canvas, gray.
43 See paragraph 8.6.
44 See paragraph 8.6.
45 See paragraph 8.6.

1 Use of shrivel or wrinkle enamel on new work has been discontinued because of difficulty in removing radiological contamination.

7. SELECTION OF PAINT SYSTEMS.-In general, paint systems for ordnance equipment should be selected in accordance with table 1, which lists uses for the various systems. It should be noted that many particular items of equipment may have more than one paint system. This is especially true as regards the external and internal surfaces of equipment.

  7.1 Shipboard Equipment:

7.1.1 EXPOSED SURFACES.-In general, fixed equipment exposed to view from sea or air is finished haze gray (system No. 22), although it may be shipped or stored with system No. 2 applied.

Obviously, it is not necessary to repeat the primer coat when additional coats are applied after installation. Previous procedures in which ocean gray was used for exposed surfaces are now superseded.

7.1.2 UNEXPOSED SURFACES.-Surfaces of shipboard equipment not normally exposed to view from sea or air are painted in accordance with the type of equipment or parts, their location, or their function. The various uses indicated in table 1 should be referred to for selection of suitable paint systems.

7.2 Underwater Equipment.-Equipment such as mines, which may be in continuous contact with water, require different types of paint from those used for shipboard equipment. Systems 46, 46A, and 48 are applicable.

8. PAINTING AND SEALING DETAILS.-In this section, various detailed procedures in connection with painting are considered, such as atmospheric conditions, paint thicknesses, sealing against water entry, drainage, faying surfaces, and welded or soldered surfaces.

8.1 Atmospheric Conditions.-Painting should preferably be done when air temperatures are between 60 and 90 degrees F., and when the relative humidity is not over 65 percent. It is realized that such conditions are not always obtainable. In no case should painting be done in windy weather (because of the possibility of dust deposits), or when the temperature is below 40 degrees F. or the relative humidity exceeds 85 percent.

8.2 Conditions of Surfaces.-Thorough surface cleaning and preparation is a prerequisite for acceptable painting. The procedures shall consist of complete removal of rust and mill scale; solvent removal of oil and grease; removal of all dust and dirt; and thorough drying. Welding and soldering should preferably not be done after painting; but if any welding or soldering is done, all surfaces within the heat-affected zone shall be cleaned, reprimed, and repainted. Similarly, when


painted surfaces have been marred or abraded, or show rust, the affected areas shall be recleaned, reprimed, and repainted in the same manner as the original surfaces.

8.3 Paint Thicknesses.-Although it is desirable to prevent build-up of heavy paint coats, certain minimum thicknesses are recognized as desirable for best protection. Primers and paints shall normally be used as supplied, in accordance with specifications, or thinned only as specified.

Thicknesses of the dry coatings shall be as follows:

Primers-0.5 to 0.8 mil per coat. (Not applicable to pretreatment coating, MIL-C-15328.)

Paints, enamels, varnishes, and lacquers-0.8 to 1.2 mil per coat.

Sprayed finishes shall be built-up to the same thicknesses as required for brush or dip coats.

8.4 Water Seals and Drainage.-Since considerable damage may be done by the retention of water, particularly salt water, in cavities, cracks, recesses, etc., it is of the utmost importance to guard against such damage by proper design, and by the use of sealing materials where necessary. Drainage holes should be provided wherever horizontal surfaces might retain water. Irregularities in surfaces which prevent free drainage may be smoothed by the application of as many coats as necessary of Specification MIL-S-974 surfacer over the priming coat, and sanding smooth. Rough or pitted surfaces, seams, joints at faying surfaces, etc., may be filled with Cement, Smoothing, Specification MIL-C-15202, after priming. Bases of metal enclosures generally are sealed with calking compound, Specification MIL-C-15705.

8.5 Faying Surfaces.-Surfaces of metals in close contact are termed faying surfaces. When such surfaces move with respect to each other, they usually are lubricated and require no other protection. Treatment of laying surfaces which are fixed relative to each other depends on whether the metals are similar or not. In some cases, metal surfaces are in contact with wood, and therefore require special protection because of the tendency of wood to retain water.

8.5.1 Wood.-Wood in contact with metal shall be given two coats of varnish, Specification MIL-V-1174. The metal shall be given two coats of primer, MIL-P-6889.

  8.5.2 SIMILAR AND DISSIMILAR METALS.- Each of the following groups of metals is considered to contain similar metals. Corrosion due to electrolytic action is least likely when the metals are in the same group. Unless properly insulated from each other, metals from different groups should not be placed in contact. The metals referred to are those on the surface, e.g., zinc plating or coating.

Group 1-Magnesium and its alloys.

Group 2-Cadmium, zinc, and aluminum, and their alloys.

Group 3-Iron, steel, lead, tin, and their alloys (except "Stainless" steel).

Group 4-Copper, chromium, nickel, silver, gold, platinum, titanium, cobalt, and their alloys; stainless steel.

8.5.3 TREATMENT OF FAYING SURFACES.-All laying surfaces of metals, whether similar or dissimilar, shall have at least two coats of primer, MIL-P-6889, applied to each surface. Each coat shall dry hard before the next coat is applied. When the metals are dissimilar, extra protection may be obtained by the extra insulation provided by the use of a zinc chromate impregnated sheet or tape, Specification MIL-P-2829. After the surfaces are joined, it is equally important that moisture be kept out by using additional coats of paint and, where necessary, sealing or calking materials (see paragraphs 4.3 and 8.4). In the case of slip fits or press fits, some protection is afforded by coating with MIL-P-6889, and assembling while still wet. However, such treatment cannot take the place of proper sealing and painting of the adjoining edges.

8.6 Electric Cables:

8.6.1 RUBBER-COVERED.-When protection of exposed rubber-covered cable is required, the cable shall be cleaned with dry cleaning solvent, specification P-S-661. If the sheath or jacket is badly checked or cracked, repeated applications of electrical insulating varnish, Specification MIL-V-1137 should be made by rubbing with a cloth until all cracks are filled, allowing sufficient time for drying between coats. A brush-coat of the same varnish shall then be applied. For undamaged sheaths, only the latter is necessary. This should be followed by a coat of aluminum


varnish (table 1, No. 30) and a final coat of paint to match the surroundings.

8.6.2 ARMORED CABLE.-Metal-armored cable shall be painted before pulling through and strapping, and before assembling the gland nuts at the stuffing tubes. Paint system No. 25 shall be used, followed, if necessary, by a final coat of paint to match the surroundings.

8.7 Workmanship.-Preparation for painting and application of paints shall be in accordance with good standards of workmanship. Every precaution shall be taken that surfaces are thoroughly cleaned and prepared. Paint shall not be applied over

  greasy or damp surfaces, or over any foreign substance. Except where otherwise specified, coats of primers, sealers, paints, enamels, etc., shall be allowed to dry hard before the next coat is applied. Paint coverage shall be uniform and unbroken.

8.8 Painting Instructions.-Any special instructions regarding application of paints, place of painting, intervals between coats, etc., shall be included in the contract or other documents applicable to the equipment. In some cases, for instance, an item may receive some of the paint coats during manufacture at one location, and additional coats after the item is shipped or installed.


SNDL Part 2 (No. 25)
Two copies each unless otherwise excepted:

A3; A5 (BUAER, BUORD, BUSHIPS); B1, B5; E1, E2; F1, F2, F3; K; L; M16, M17; P; R1, R10.

Requests for additional copies of OSTD 52 (20th Revision) should be submitted to the Superintendent, U. S. Naval Gun Factory, Washington 25, D. C.
20 July 1955/3M/1


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