Join Date: Apr 2006
Thanked 160 Times in 157 Posts
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"Fiberglassing above one's head is possible. Matching gelcoat is a bear."
Working upside down with fiberglass can be a bear too, it will try to drip down into your hair and eyes. Often successfully. Matching gelcoat color...well, there are guys in the body shop and auto upholstery repair business who match those colors all day, but they've got a talent for it and lots of practice. I'd settle for matching the texture and then putting upholstery or padding over it, like carpenters say "that's what trim and molding is for".
Or, you go in from above and do your deck repair from above, applying anti-skid locally or refinishing the deck to hide the work.