[DarrenX33]

Ok, here is some POR-15 info. You can either scuff/sand the floor or acid etch (muratic acid) it. Make sure your rinse it real well and it is completely dry. POR-15 even makes a marine prep cleaner (apparently recommended for concrete surfaces) that should produce the same or better results. Now for doing an average 3 car garage my brother-in-law used 2 one gallon cans with some to spare. Good for 2 coats. He used 2 throw away paint rollers. Obviously the better quality roller the better it will turn out. Then paint brush the corners. POR-15 is UV sensitive on its own. I was told after a day or two with the garage open the finish sitting in the sun lightened up. If this bothers you they make a clear that the UV won't bother.