a. Wash the interior of structures through drilled
15-2. Cleaning Procedures.
access holes to remove mud, dirt, and rust. Use of a
h i g h pressure washer will facilitate this operation.
observe the water flushed through the rails to
determine when it 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.
Allow painted areas time to dry before rustproofing.
Steam cleaning will not be used.
Section Il. RUSTPROOFING PROCEDURES
15-3. Rustproofing Procedures.
Do not spray any portion of moving compo-
nents, transmission, transfer case, cylin-
ders, pumps, valves, prop shaft, exhaust
system, rubber bump stops, brakedrums,
brake backing plates, parking brake linkage,
shift linkage, tires, electrical components,
engine linkages, or air intake systems. Cov-
er all areas with paper where necessary.
There are areas where a 10 mil wet film
thickness cannot be obtained without
wasting a large amount of compound. In
those areas, complete coverage of the
surface area is necessary at whatever
thickness is obtainable.
Figure 15-2. Rustproofing Van Underbody.
For rustproofing procedures of specific
b. Spraying Pressure. The rustproofing compound
should be applied to sheet metal and structural
members in even coats. Spraying pressure should be as
low as possible while maintaining an even spray pattern.
a. Dry Film Thickness Requirements. A five mil dry
An acceptable starting point is 40 psi (276 kPa), but
film thickness is required for adequate rustproofing
adjustments may have to be made due to temperature
protection. A 10 mil wet film thickness is required to
changes and differences in rustproofing compound.
obtain a minimum five mil dry film thickness. If
Using too much pressure will waste compound by
needed, the vehicle can be resprayed to reach proper
causing overspray and excessively thick coatings.