Etching is a crucial step in preparing concrete for painting. It gives the surface tooth to adhere to, so your paint is more likely to stick for a long time. Most concrete paints require etching and if they don’t, do it anyway. Don’t skip this step if you want a long-lasting painted concrete floor.
Step 1: Clean the concrete. Power wash concrete and make sure it is free from dirt, dust and debris.
Step 2: Remove oil stains using a powerful degreaser such as EpoxyShield Oil Stain Remover. Paint will not stick to oily concrete, so be sure that any grease and oil stains are cleaned as thoroughly as possible.
Step 3: Apply etching solution. For garage floors and other smooth-troweled concrete, mix ½ gallon of Rust-Oleum Concrete Etch to ½ gallon of water in a garden watering can. Working in 10’ x 10’ sections, dampen surface with water and apply Rust-Oleum Concrete Etch. Use a stiff-bristled broom, scrub solution into surface until foaming action stops.
Step 4: Rinse surface thoroughly with a strong stream of water, scrubbing while rinsing to ensure removal of all material. Surface should feel rough (like 150 grit sandpaper).
Step 5: Let surface dry then check it by applying a few drops of water. It should penetrate quickly, if not, re-etch the concrete.
Step 6: Allow surface to dry thoroughly before applying paint or stain.
note: Smooth troweled concrete (i.e., carports, garage and basement floors) generally requires two applications to achieve a proper surface profile.
