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I am working on a 22 guardian which had a lot of spider cracks and damage. (no paint topside) I used West System Epoxy for all the repairs. The recommendations i have found for spider cracks call to grind the gel coat and re-build with glass. The spider cracks were so close together i didn't want to grind that much gelcoat. I sanded really good, ground out major cracks, filled and faired then added a few layers of glass cloth with epoxy resin in the really bad areas . I used 2 part polyurethane for the paint . It seems to have turned out well but time will be the true test. There is a web site called Boat Works Today which has really good video's of different boat repairs.

Good Luck!