Posts Tagged: block sanding techniques

Avoid Paint Failure: How to Prepare Bondo for Primer

Professional Guide: How to Sand and Seal Bondo Before Paint Quick Summary The key steps to preparing Bondo for priming are simple but critical: 1) Shape the Bondo with 80-grit. 2) Refine it with 180 grit 3) Finish it with 320-grit 4) Feather the edges correctly 5) Eliminate pinholes 6) Seal everything with epoxy primer before painting. If you rush the sanding process or don’t fully cure the filler, it will shrink, pinhole, or bleed back through the paint. When you prepare Bondo correctly for primer application, you can skip … Read More