Wondering how much Duratec I will need when re coating my floors? I plan on going up to the top of the gunnal's and doing the transom and bulkhead. I don't want to run out right in the middle.I was planning on using the Duratec highgloss top coat (904-040) and thinning it with the high gloss additive #904-001. Has anybody thinned it with the gelcoat additive or should I use MEKP solvent to thin it? Also what size tip should I use in a HVLP gun?