Section Il. RUSTPROOFING PROCEDURES
11-3. Rustproofing Procedures.
(1) Insert 90 degree short tool in holes A and
coat boxed-in section of center support.
(2) Use short rigid tool to completely cover the
underbody, including open access surfaces on side,
Do not spray any portion of moving
cross, and longitudinal sills.
components, transmission, transfer case,
cylinders, pumps, valves, prop shaft,
exhaust system, rubber bump stops, brake-
drums, brake backing plates, parking brake
linkage, shift linkage, tires, electrical
components, engine linkages, or air intake
systems. Cover all areas with paper where
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.
. For rustproofing procedures of specific
a. Dry Film Thickness Requirements. A five rnil dry
film thickness is required for adequate rustproofing
Figure 11-3. Rustproofing Underbody.
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
Insert long rigid tool to the base of stake pockets A and
withdraw slowly while coating the entire surface.
b. Spraying Pressure. The rustproofing compound
should be applied to sheet metal and structural
11-4. Rustproofing Inspection.
members in even coats. Spraying pressure should be as
low as possible while maintaining an even spray pattern.
Check the vehicle to ensure that all areas requiring
An acceptable starting point is 40 psi (276 kPa), but
rustproofing compound have been properly and
adjustments may have to be made, due to temperature
changes and differences in rustproofing compound.
Using too much pressure will waste compound by
a. Check seams, welds, corners, and boxed areas to
causing overspray and excessively thick coatings.
ensure that they are adequately coated.