I have a 1974 h-14,I sanded the hulls all the way doun to the gel coat primed and sanded between each coat with a tot of 3 finish coats.The results were beautiful!! Check out yacht paint .com . The brand was Interlux Brightside, coupled with the reccomended primer this makes a very durable finish.I have beeched on rough shores and have yet to scratch or gouge this finish it is as strong as gel-coats .I did not have access to a booth .Instead I used a foam roller & got an auto like finish!!
good luck west marine carries this paint