Put down epoxy with some grit. The flakes look great but the surface becomes extremely slippery when wet. If the concrete isn't new you will need to shotblast the surface to insure adhestion. primer, topcoat, spread grit, topcoat over the grit.
yes, I built short because of cost and now if I want to park my truck and trailer inside and keep them attached for quick exit I am about 6" too short. Oh, how i wish I had another 5 feet. Once its done you cant make it bigger. Don't make the same mistake i did