first you remove the rust, then depending on how much metal is missing
from the rust then you apply BONDO or a similar product and then sand it
down to the appropriate level, you want the bondo to be level with the
metal surrounding the area that you got the rust from.. then you sand it
out(the bondo) and then put the putty on the area (putty is used to fill
up the areas that bondo does not(you want it to be as smooth as
possible), i dont know what kinds of putty you have available, whoever
you get it from ask them, they can read the tube and let you know.....
then you sand the putty with a 600 git sandpaper and then if you are
satisfied you prime and sand some more down to a 600 grit wet paper or
smoothere and then spray you color coat... hope this helps... i got this
from a 1970's book... dont know what they use now, they never used clear
coats back then, at least as far as i know?????
If there is going to be any time whatsoever between patching and final
coat, make sure to cover the repair with primer/sealer. The reason for this
is that neither Bondo or regular primer are water tight. Many Bondo jobs
fail eventually because they were left unsealed, and moisture got through
to the metal underneath. Rust under the Bondo - we've all seen it.
I make it a habit to spray the entire area with a rust converter before
patching. The effectiveness of these things are always debated, but I
figure it can't hurt. There are always going to be tiny rust particles, no
matter how fine you sanded, and rust never sleeps as long as it has oxygen.
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