Quote:
Originally Posted by Mitch Leland
Always put the filler on a well prepared surface that is clean and rough up, preferably bare metal, not over a painted surface.
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Sticks well to any rough, cleanly prepared surface. Maybe what you mean is that the surface must be stable. Paint that is checking or going away, will still go away at the feathering point if not prepared correctly and sealed correctly. Just my experience, YMMV.