Exit1965, I have to say that it is really strange about the Acetone and mineral spirits thing. I have two cans of the professional here in my house. The flat black from just last fall and they both say to thin with Rustoleum thiner and cleaner or mineral spirts. And do not thin with gasoline, lacquer thinner, turpentine etc.
I also read the label closer and there is a small block on the side labeled NJ and PA right to know. And guess what it says the professional line has in it-Alkyd Resin. While right on the front it says oil based so it appears that oil based can also be alkyd based and that our products are probably similar to the Tremclad. Anyway no pressure but we are awaiting your test panel with the professional line to see if there is a difference.
Todd


1969 Ply Roadrunner, 383 4-speed on street tires. 3,830 lbs race weight. Best 1/4: 13.1 @ 106.83 440 & overdrive 4 speed going in. 2005 Power Wagon 35X12.5 KM2's