Currently, between boats.
Join Date: Nov 2006
Location: Chicago, IL
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Try your local West Marine before trying to play "home chemist". They often have it at the ones around here, anyway (Chicago), so you may get lucky as well. The paint job you're doing is fussy enough without adding variables to the mix. Sometimes your West Marine might carry 333N and not 2333N, and you could "get by" with that in a pinch.
If I were you (and I was in your shoes a couple months ago when I, too, painted my sailboat using Interlux 2-Part Perfection and forgot to order the thinner) I would hold out for the real deal. I drove around the Chicago area to 5 different West Marine stores and finally found two stores that carried the 2333N thinner (which was odd, since they dont carry the Perfection at that particular location, but anyway I digress).
Waiting a week on the thinner (if you have to order it) is cheaper than having to redo your paintjob when it starts peeling in a year because you used the wrong thing.
(In my opinion)