a. Wash interior of frame rail structures through
drilled access holes to remove mud, dirt, and rust. Use
of a high pressure washer will facilitate this process.
Observe the water flushed through the rails to
determine when the structure is clean.
When cleaning, water may be discharged in
excess of 1200 psi (8274 kPa) from high
b. Allow at least four hours for vehicle drying.
pressure water equipment. Serious injury
Additional drying time may be required if unfavorable
could result. Eye protection must be worn
weather conditions exist. Compressed air may be used
to prevent injury.
to speed up the drying process.
c. Prime and paint those areas showing bare metal.
Use inspection light where available. Allow painted
areas time to dry before rustproofing.
Steam cleaning will not be used.
Section Ill. RUSTPROOFING PROCEDURES
a. Dry Film Thickness Requirements. A five mil dry
film thickness is required for adequate rustproofing
protection. A 10 mil wet film thickness is required to
obtain a minimum five mil dry film thickness. If
needed, the vehicle can be resprayed to reach proper
Do not spray any portion of moving
components, transmission, transfer case,
cylinders, pumps, valves, prop shaft,
b. Spraying Pressure. The rustproofing compound
exhaust system, rubber bump stops, brake-
should be applied to sheet metal and structural
drums, brake backing plates, parking brake
members in even coats. Spraying pressure should be as
linkage, shift linkage, tires, electrical
low as possible while maintaining an even spray pattern.
components, engine linkages, or air intake
An acceptable starting point is 40 psi (276 kPa), but
systems. Cover all areas with paper where
adjustments may have to be made due to temperature
changes and differences in rustproofing compound.
Using too much pressure will waste compound by
causing overspray and excessively thick coatings.
There are areas where a 10 mil wet film
thickness cannot be obtained without
wasting a large amount of compound. In
(1) Insert 90 degree short tool into body
those areas, complete coverage of the
support channel holes A, B, C, and D and spray in all
surface area is necessary at whatever
thickness is obtainable.
(2) Insert 90 degree flexible tool in cargo bed
For rustproofing procedures of specific
channels as far as possible, then withdraw tool slowly