At work we use three different things. We will tin knock it the best we can or grind down the weld and the area to e filled. Then we apply a fiberglass putty and grind it down then hit it with 80 grit. After that with use a body filler to fill in the major scratches and figure out any more high and low spots. If neccessary we have a rally fine putty that is used t just fill in scratches from the 36 and 80.
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