Preparing a Concrete Floor for Sealing

To ensure good adhesion of a sealer, the concrete must be prepared before sealing. Unsealed concrete is very absorbent, so it is prone to staining. If the concrete was previously sealed, it will need to be stripped.


  1. Test for old sealer on the floor. Apply a few drops of muriatic acid to the area. If it fizzes, there is no sealer present. If it doesn’t fizz, there is sealer present and the floor needs to be stripped.
  2. If no sealer is present, clean the surface by applying Unitex Powerhouse Degreaser diluted at 64 oz per gallon of water with a mop to a small area of the floor. Use a floor machine with a green pad to clean the area. Pick up slurry with a wet/dry vacuum.
  3. If sealer is present, strip the floor using Unitex Meltdown Plus Stripper diluted at 32 oz per gallon of water. Apply to the floor using a mop. Scrub the floor with a floor machine and black pad or steel wire brush. Pick up slurry with a wet/dry vacuum. Neutralize floor by applying by mop Easy Pak Neutralizer diluted at 1 packet per 3 gallons of water.
  4. To etch concrete that has never been sealed: Ventilate the area. Be sure to wear personal protective equipment including a respirator. Using a mop apply muriatic acid to floor. Let the floor dry for at least 24 hours before sealing.

Warning: Always follow label directions, and never mix product unless specified in the label directions. Each situation reacts differently and results may vary.