I have always wanted to paint our garage floor and we finally did. The process is a little more involved than painting a wall. To paint a concrete floor you must first completely clean the floor of everything, including oil that leaks from cars. If there is any petroleum based deposits then the paint won't adhere. In our case the floor was free of oil drips so the cleaning process took an hour. Then they grind the concrete to make the finish rough. There are big grinders and hand grinders but all of them have industrial diamonds to scratch the concrete.
We used a two coat process of epoxy for the first coat and then an epoxy sealer with an aggregate thrown over the final coat for grip. Each coat takes 24 hours to dry. I assumed that we could chose either grey or grey since those are the only colors I have ever seen on a garage floor. Heh Heh. They gave me a paint sheet with hundreds of colors so I chose a matching color to the exterior trim. The aggregate is essentially miniature glass beads that keep the floor from getting slippery and reflects light similar to the way paint on roads a streets reflects your headlights.
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