Quote:
Originally Posted by Pintsize725
I wanted to put the putty on the back and front for more a filled type job. I'll do the front side first and see how it holds up.
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You shouldn't need to sand the backside. The fiberglass on the back should be plenty rough for the putty to adhere. There are lots of nooks and crannies for it, too. Shouldn't be an issue. If you really want to sand it, just do what Fire said, and make sure it's a light sanding
