said by Icarus:BTW,what are your plans for the poly? I would advise against mixing the 2 as exteriors polys are less durable than interior versions.
I just want to put one coat on the top side of some 3/4" particle boards (floor for a walk in closet) before assembly. (I will put on another coat or two later on, but that won't happen for a while)
When you say mineral spirit, you mean just paint thinner, or something more specific?
BTW, the polys are from Home Depot; Minwax fast drying polyurethane, and Minwax indoor/outdoor helmsman spar urethane, both clear semi-gloss. I last used them 3 and 5 months ago.