Light sand with 600grit, nice thick layers with recoats within a half hour or you cant lay more down for a week or you'll get fisheyes and bubbling.
Appliance epoxy in rattlecans, its durable as hell, theres quite a few people who have done it on this forum, ive been using it for a long time on my stuntbikes.
Comes out like you layed clear down and theres no need for clear unless you want super gloss, in which case get an epoxy clear, its the only ones that will work well. Wet sand after 24 hours (after it cures) and reapply as needed.
If done right you can hit it with a hammer and it wont chip or crack.
I'll be doing the rest of the boat this week and finish up the design for the vinyl machine. After vinyl is applied ill be laying epoxy clear over it and it should last me longer than I'll have the hull.