Well, one has to take my advice with a grain of salt, because we all know I'm a bit over the top. My girlfriend says OCD... Anyway, I have wet sanded, compounded, polished, and waxed every bit of smooth gelcoat I can get to, including all around the cockpit, the cabin top, the mast step, the forward hatch surround, and even the little bit of smooth gelcoat around the stemhead fitting. (I couldn't leave it chalky, it was bugging me.)
Adjacent non-skid areas have a bit of gloss to them as a result of the buffing process. I have heard that some people buff the non-skid with thinned out compound. I don't want to do this, because I think it will wear some of the height of the diamond nubs that make up the non-skid.
Last year for my Harpoon, I used some Star-brite non-skid cleaner, and then I put Woody Wax on it. Woody Wax is a thin, spray on type stuff not unlike Armor All in appearance. It is supposed to protect the fiberglass, and not be slippery once it's applied properly. I found that a little bit goes a very long way, it doesn't last very long, and water doesn't bead up on it. However, it really did seem to keep the non-skid more clean, and made it easier to wash when it needed it. If you search around on the interwebs, you'll see many fishermen swear by it, that fish blood just washes right off with a hose.
But you'll also find an equal amount of glowing reviews for Aurora Sure Step. This is another protectant designed for non-skid, that is supposed to increase the grip when wet. I really wanted to use the Sure Step on the O'day, but if you review their web site, they recommend $15 of Boat Clean Plus to remove wax, oil, and contaminants, followed by $15 of Boat Scrub with a stiff bristle brush, and finally $27 of the Sure Step protectant. Unfortunately, after spending $100 on 2 cans of Cetol and a quart of bottom paint, I decided to just make due with the Woody Wax I already have.
Mind you, I don't expect I'll ever run out of Woody Wax. Application consists of 2 squirts of WW on a soft bristle brush, rubbed all over the wet non-skid, allowed to dry, then hosed off and polished with a cloth.
Another way to look at non-skid, you kinda want it to be flat, otherwise, it'll have too much glare...
Brian