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Is epoxy based fairing the way to go or polyester based? Should I use polyester based on areas that I'm not making repairs with epoxy and quick fair on the areas with epoxy?

In the areas that I've sanded to the fiberglass, do I rebuild those spots up with fairing or should I spray gelcoat to rebuild and replace what was sanded off? Or is it okay to simply fair over to level it and then epoxy prime?

Last, regarding hidden spots. Are you referring to the method of spraying, sanding the spray off with a flat board in order to show the valleys?