X2 I bought a quart of POR 15 Semi Gloss and used it on my engine bay, trunk, a tool box, and some other minor projects and have barely used 1/4 of it. I have it in the fridge in a glass jar. I'm going to do my floors next and can't see using more than 1/2 a cup of the stuff.
I would avoid the Semi Gloss though because the semi-and gloss aren't very even when painting over any existing coating. Over bare metal it looks great though.
