Flow coating.

TM 38-260

(a) When dipping parts of equipment, hold the parts by metal tongs, by hand (rubber gloves must be

worn), or by a wire basket. Wire baskets are used to dip small parts in large quantities. Parts should be placed in the

basket in such a manner as to permit the formation of a continuous unbroken preservative film around each part.

(b) Parts shall be dipped in the temperature range set forth in the preservative material specification.

Parts should be introduced into the tank so that air bubbles are not caught on any surfaces of the parts. All items dipped

should be completely immersed.

to prevent entrapment of the preservative in holes, cuts, or recesses.

(d) Do not disturb the finished coating until the preservative dries and sets. Bare spots left by hooks

or baskets should be touched up with a brush.

(e) Parts, dipped separately, should be hung individually on hooks, rings, rods, or racks until dry.

items dipped by basket should be left in the basket until the preservative film sets. Under certain conditions,

preservative P-19 of table 2-1 will not dry fast enough to permit continuous operation. Normally the coating should feel

dry to the touch within 4 hours. Where a more rapid setting is desired, infrared drying lamps or ovens may be utilized.

(2) Flow coating. Before flow coating the surfaces, the surfaces to be protected must be clean and not

touched with bare hands or dirty gloves.

(a) Use sufficient preservatives to completely cover the desired areas and then allow the excess to

drain off by gravity.

(b) Position items before coating, and drain after coating in such a manner as to prevent collecting of

the preservative in blind holes or cavities.

(c)

Ensure that all surfaces requiring preservatives are sufficiently coated.

(d)

Ample time must be allowed for draining and setting of the preservative before further processing.

(3) Slushing. Slushing is accomplished by pouring the preservative into the part to be preserved, and then

rotating, agitating, or positioning the part to ensure complete coverage of all internal surfaces.

(a)

Never mix two different preservatives for slushing, as this may create an ineffective chemical

solution.

2-19