c. Prime and paint those areas showing bare metal.
weather conditions exist. Compressed air may be used
Allow painted areas time to dry before rustproofing.
to speed up the drying process.
Section Ill. RUSTPROOFING PROCEDURES
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
b. Spraying Pressure. The rustproofing compound
components, transmission, transfer case,
should be applied to sheet metal and structural
cylinders, pumps, valves, prop shaft,
members in even coats. Spraying pressure should be as
exhaust system, rubber bump stops, brake-
low as possible while maintaining an even spray pattern.
drums, brake backing plates, parking brake
An acceptable starting point is 40 psi (276 kPa), but
linkage, shift linkage, tires, electrical
adjustments may have to be make due to temperature
components, engine linkages, or air intake
changes and differences in rustproofing compound.
systems. Cover all areas with paper where
Using too much pressure will waste compound by
causing overspray and excessively thick coatings.
There are areas where a 10 mil wet film
(1) Insert long rigid tool in holes A as far as it
thickness cannot be obtained without
will go through the bottom side of the lower side rail to
wasting a large amount of compound. In
coat stake pocket gussets. Withdraw tool slowly while
those areas, complete coverage of the
applying rustproofing compound.
surface area is necessary at whatever
(2) Use short rigid tool to completely cover the
thickness is obtainable.
underbody of the dump vehicles, including open access
For rustproofing procedures of specific
surfaces to side, cross, and longitudinal sills.
dump body and tailgate items, refer to
d. Rustproofing Cab Protector Braces
the cab protector upper braces and spray in all
a. Dry Film Thickness Requirements. A five mil dry
film thickness is required for adequate rustproofing
Figure 9-7. Rustproofing Cab Protector Braces.