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Pic 1-When sanding and looking over the piece watch for slightly raised circles. When you find one apply pressure see if it’s filled with air of just a drop of resin or something else.
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Pic 2-If it colapses in Congratulations! You found an air bubble. Now go over the whole bumper (in this case) and find them all!
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Pic 3-Now dig it out, fill it, sand it, primer and repeat if necessary.