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OK, what I do when confronted with screw holes in non-skid is to simply put screws back into them. It is impossible to match non-skid gelcoat patterns, and I have found that the screws look like they were always supposed to be there, even in show quality boats this works.

I use the same size diameter screw that was originally in there if possible, to use the existing threads. In your case, you would use #14 size, maybe 3/4" or 1" long at the most. Screws should be SS phillips flat head self tapping screws. Nicely countersink the gelcoat/glass skin so the screw head fits flush, squeeze clear silicone caulking into the hole, and set the screw, wiping off excess. Seal is accomplished, and it looks great. You'll be surprised how well this works. I have used this in several of my boats, and nobody is the wiser.

If you look VERY CLOSELY at this photo of my 1971 Classic Ribside 21, you can see where the original battery was installed directly in the center of the boat (enlarge photo to 100% size). Even though this was where BW reccomended the battery be, I moved it to an improved location. You can see the flat head screws set into the original holes. Looks pretty good, right?

http://smg.photobucket.com/albums/v42...CN1360.jpg

I even had to do this in my then brand new 25 Outrage, where a dealer's mechanic installed the RPS in the wrong location, and the screw holes had to be filled. In the brand new boat, it still looked good.

Good luck with your project.