I just restored my gelcoat with a wetsand, compound, polish and wax process...i'd get a black foam finishing pad and use 3m finesse-it II. You'll be amazed at how well that works. Some guys say that an orbital doesn't do enough and to use a variable speed polisher. I happen to have both and tested it out, the variable speed is much quicker, but the electric d/a i got from harbor freight worked just as good and seemed to work better on my black gel coat areas. If you get up super close in the right light you'll still notice micro scratches but they are less noticeable with the d/a. Foam pads are color coded and black is the finest cut, white is in the middle, yellow would be heavier more for compounding. You can even use finesse-it by hand and it works great. Id say use a straight wax afterward for more protection, but i'm no expert as this was my first attempt. My local body shop supply house and "G" from here is who gave me advice. Do a search on here for "cut polish v2" and you should get some great tips from G's thread.
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