[BradE]

Don't waste your money on the Behr stuff. A 1 part system won't hold up, even most DIY 2 part systems won't hold up. The Behr product is nothing more than a standard paint, it has no chemical hardner. Basically it air dries like regular paint, which will not be hard enough of a cure for a garage floor.

To do the job right you will need to get some professional grade 2 part epoxy or urethane. This type of paint can be expensive, sometimes over $100/gallon. The floor will need to be etched with muratic acid so the surface is perfectly clean and rough. The acid etching is key, it opens the pores of the concrete and gives the epoxy something to grab onto.

I tried the Rustoleum product as well, it was also unimpressive IMO.