Spraying.

TM 38-260

(6) Fogging. Fogging is accomplished by coating interior surfaces of items, such as tanks and chambers,

with preservatives injected as a cloud or mist from an air atomizing gun, until the enclosed atmosphere is saturated.

(a) Fill the fogging gun tanks with a light preservative oil, such as P-10, grade 30 or P-9, of table 2-1,

and adjust the preservative and air valves on the fogging gun to obtain the desired mixture for fogging purposes.

(b) Insert the nozzle of the fogging gun into the opening of the item and fog the interior until an

atomized mist begins to form around the nozzle and the opening. If more than one opening is available on the item,

repeat the process at each opening to ensure complete fogging of the interior. For extra large tanks or chambers,

extensions are available to attach to the nozzle to reach into otherwise inaccessible corners and pockets.

(7) Spraying. Spraying is accomplished by coating surfaces (exterior or interior, as applicable) of the

item(s) with preservative applied as spray. Spraying is useful for preservation of large and heavy items that cannot be

dipped, or assemblies requiring a preservative only on certain portions of their surfaces. Thin film or oil-type

preservatives usually are used in spraying.

(a) Mask all surfaces that are not to be coated, including electrical wiring, receptacles, and rubber

and fabric components. Suitable materials for masking are Kraft paper and pressure-sensitive tape. Thin film

preservatives and oils will not damage paints or primers on metal surfaces; therefore, such surfaces are not usually

masked.

(b) Spraying must be done in a well ventilated area. Wear protective clothing, such as masks and

gloves. Fill the spray gun with the selected oil or thin film preservative. Adjust the spray gun and apply an even,

continuous, and unbroken film around each item surface. Use normal spray painting techniques for applying the coating.

Allow preservative coating to thoroughly dry or set before handling.

(8) Circulating under power. Internal mechanisms and systems are preserved with an oil type preservative

with the machine operating under power.

NOTE

NEVER USE PRESERVATIVES P-11 OR P-21 OF TABLE

2-1 IN INTERNAL MECHANISMS HAVING SMALL

INTEGRAL OIL LINES.

THE PRESERVATIVE WILL

HARDEN AND REMOVAL IS VERY DIFFICULT.

(a)

Operate the machine at its lowest speed, to ensure circulation of preservative throughout the

system.

(b)

After thorough circulation drain the oil and close all openings.

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