I just used 2 qts on our 22 ft. FC... I would say 3 qts. minimum, that allows two good coats. Be forewarned DO NOT get it on you, and if you do IMMEDIATELY clean off (I used acetone). A couple of tips--apply a good coat of your wifes hand cream on all parts of your exposed (and yes it will bleed through your clothes onto your covered) and unexposed skin. Use lots of gloves on your hands. It takes about 2 to 3 weeks of scrub/sand/scrape, wear to get it off. 'YOU HAVE BEEN WARNED!!"