Originally Posted by klhansen
Could also be fish eyes, which are caused by oil or silicone contamination of the substrate. I've torn my hair out over those when refinishing some doors for my house (the wife wanted gloss frown ).

Here's some info that should help you figure out a solution.

http://www.searchautoparts.com/abrn...iques-how-approach-commonly-seen-defects

Yup, fisheyes. Be sure to use a good wax & grease solvent prior to painting. It's also a good idea to clean a surface prior to sanding. I have seen surface contamination driven into sanding scratches by the sanding process. If you don't want to by a large quantity of a commercial wax & grease remover for a small job, common mineral spirits will do a good job for you.

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