How Should I Prepare the Garage Floor for Painting?There are a few steps you should take before painting if you want it to look like a pro did it:
- Move everything off of your garage floor.
- Remove oil and grease spots by absorbing them with sawdust or kitty litter, and sweep up using a rigid-bristled broom. Pour dry dishwasher detergent or a concrete cleaner on the stains and let it sit 45 minutes. Then pour boiling water on the stains and vigorously scrub with a broom.
- Fill in small floor cracks with an epoxy paste and scrape up any excess paste. After it dries, lightly sand it for a smooth finish. If you have a large crack, overfill it with epoxy, let it dry, and then grind the area until it’s flush with the floor.
- If you think you have a moisture issue that might prevent paint from bonding to the floor, cut out a square of plastic sheeting and tape it down over your entire floor. Wait a day to see if water collects on the underside of the plastic. If it does, you’ll need to put down a good vapor barrier before painting the primer coat.
- If your floor has been sealed previously (you’ll know it has been sealed if water beads up on the surface) then you’ll need to etch the floor before painting. Do this by applying a commercial concrete etcher and let the floor dry overnight.
- Sweep well and power wash.
How Do I Paint a Concrete Garage Floor?When it’s time to paint, the process is surprisingly easy:
- Make sure you leave your garage door open for ventilation during painting.
- Apply sealant to your garage floor. This will help with paint adhesion and acts as a primer as well. Use a nylon brush around the edges of your garage floor and a roller (lint-free, all-purpose, solvent- and water-resistant with a medium nap and an extension handle) to apply sealant liberally to the rest of the floor. Let it dry at least 8 hours.
- Mix your paint well and apply a thin, even first coat, cutting around the edges with a brush and using a roller (with a medium nap) for the rest. Let it dry for 24 hours before applying a second coat.
- Wait at least 24 hours before walking on the newly painted floor and a week before driving on it.