how old is your aquasport? if its just dull with no major gouges to the fiberglass, all around , then no need to paint start sanding with as low as 220 go all the way to 2500, then compound with aquabuff and polish, i like wizards polish the best as it has synthetic polymers and really great product , as for painting , depends entirely on your budget and the amount of work you wish to do and results you want to achieve, and how long you plan on keeping the boat, if its a lifetime keeper family heirloom, then ,, go alexseal or imron with epoxy primer, stay with one system , use all of their products, if you plan to keep for a few years and then sell, you could do rustoleum metal primer , then rustoleum enamel with the tci acyrlic enamel wet look hardner. as for sanding depending how bad it is you may have to start at 80 then go to 320 for primer, high build primer, sealer then final 2 -3 coats. i would spray, practice on some cardboard , or melamine or a piece of glass for final, keep gun moving at all times , setting fluid needle about medium and air according to paint and gun, i live the LVLP PAINT GUN, BUT i have HVLP and lots of brands , probably 10 guns for various uses, i also highly reccommend just spraying with gelcoat, its the cheapest , and strongest of them all and that is what the boat was built from by the factory, use duratec additive to cut down on sanding, or if you cheap, just use 40% laminating resin, 50 gelcoat and 10% acetone, then you can start wet sanding , with a block of course or staight line sander (hutchins), with 600 , 800, 1200, then compound , polish.........hope this helps