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There are a lot of good products out there, but in the interest of easy availability, non-chandlery prices, and good tech support from a one-stop shop? I'd call 3M's toll-free number and ask them for specifics about using their fiberglass polishes and products on it. I'm sure you can find their automotive products division on the web, that'll get you started. They are great about getting you to the right department, for ANY product they make, if you call.
Their fiberglass products are used in the auto body shop industry as well as marine and other users. They'll probably tell you to lightly compound the deck (to remove the chalky gelcoat) and then polish it and seal it after a solvent cleaning (i.e. "Prep Solve") to remove all materials that were used on it before. Plain solvents will remove wax--the specialty prep solvents will remove most of the synthetics, silicones, etc. as well.
There are also anti-skid deck waxes, I don't know if 3M makes them, but I'd apply that as the last step to any flat deck surface that you're going to polish.