[Linesider82]

If the paint is not currently cracked you can just sand it (etch) lightly to help form a bond between old paint and new. If the old paint is bad, I would use a primer base coat first that is self etching after removal of the old paint (if bad). Interlux 202 is a solvent that removes mold, oils, waxes etc from existing paints. I restored a 1987 sylvan super snapper and used the interlux 202 product. It'll remove the old glue from the backs of letting, registrations etc. I used a one part interlux top coat "brightside" cut with interlux333 brushing liquid (thinner), I started with the detail work, had a buddy roll on paint over the large areas and I followed with the brush to remove bubbles with a cross hatch pattern. Let that dry, then sand, repeat 202 process to remove any doubt of oils or other contaminants then did a second coat of topside paint. Came out awesome. A half gallon should cover 2 coats. I can't speak to the fiberglass work as much, but I did use the fiberglass expoxy to seal my AC plywood decking as opposed to using P.T. ply.