Wet sand and buff is easy. Just don't use anything coarser than 400. I would start and finish with 800 wet for a stain on gelcoat
. Compound with 3M Perfect-It on a wool compounding pad, followed by Finesse-It on a foam pad, followed by hand waxing with a quality paste wax. It'll look better than new. If the rest of your boat isn't perfect, don't take it this far, then you'll have to do the rest of the hull
to make it match. Stop after compounding with Perfect-It. On a relatively flat area of hull
with no trim or hardware
in the way I like to use a DA with 800 grit film discs. Makes what would take hours hand-sanding wet take minutes machine-sanding dry. Guide coat if you are not a pro. And if your gelcoat
has porosity issues, don't bother. The stain will have soaked into the pores and you wont be able to wet sand it out without blowing through. This case would require you to shoot some gel to cover it up.