Gelcoat is a quick way to cosmetically touch up holes from old fasteners and
anyone can do it with a little practice. And if you don't like the way it
turned out the first try, you can drill out the gelcoat and try again.
Here's a link to an old article I wrote a10 years old.
http://www.blumhorst.com/potterpages/gelcoat.htm
(If you have a small section of the deck to refinish, I'd probably spray it
with gelcoat. If you need to match the non-skid texture, there's a way to do
that too, but it's a different procedure and a lot more work. If you want to
refinish the whole deck or a discrete section, then 2-part LPU paint is probbly
the top finish I'd chose.)
Fair winds,
Judy B