TB 43-0213
Section Il. RUSTPROOFING PROCEDURES
22-3. Rustproofing Procedures.
CAUTION
Do not spray any portion o f m o v i n g
components, rubber bump stops, brake-
drums, brake backing plates, parking brake
linkage, tires, or electrical components.
Cover all areas with paper where necessary.
NOTE
There are areas where a 10 mil wet film
q
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.
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Figure 22-5. Rustproofing Underbody.
For rustproofing procedures of specific
q
(4) Use short rigid tool to cover the entire
Figure 22-8.
underbody.
(5) Use 90 degree short tool to cover all
a. Dry Film Thickness Requirements. A five mil dry
inaccessible areas. These areas include under fenders,
film thickness is required for adequate rustproofing
inside open frame and body channels.
protection. A 10 mil wet film thickness is required to
obtain a minimum five mil dry film thickness. If
d. Rustproofing Drawbars (see Figure 22-6). Insert
needed, the vehicle can be resprayed to reach proper
flexible tool as far as possible into front of the drawbar
thickness.
openings, then withdraw tool slowly while spraying.
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.
An acceptable starting point is 40 psi (276 kPa), but
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.
c. Rustproofing Underbody (see Figure 22-5).
(1) Insert 90 degree short tool into center
framerail holes A and spray in all directions.
(2) Insert flexible tool into body support
channel holes B as far as possible, then withdraw tool
slowly while spraying.
(3) Insert flexible tool into both ends of body
channels 3 and 4 as far as possible, then withdraw tool
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slowly while spraying.
Figure 22-6. Rustproofing Drawbars.
22-3