Use the rougher grit and the high psi washer, then hit it with 80 grit. Use 2 to 3 coats of barrier coat then bottom paint it is going to take too much time and patients to get back the gelcoat. If you are going to trailer the boat get a bottom paint with less ablatives so the loading of the trailer is not always marking it up. I used interlux VC and seemed to work great, you can also burnish it to a shine.
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