Applying Water-Based Sealers

Water-based sealers tend to foam and bubble after being applied with
a roller. Instead, use a micro-fiber applicator.

Question:
What is the best method for applying water-based sealers?

Answer:
Water-based sealers require a different method of application from traditional solvent-based sealers. Unlike solvent-based products, which are basically resins (acrylic, wax, polyurethane, etc.) dissolved in solvent, water-based sealers use a mixture of water and other chemicals to keep the dissolved resin in suspension. Because of this emulsion chemistry, these sealers tend to foam easily when applied by a sprayer or roller, resulting in lots of soap-like bubbles. Thus the best method of applying a water-based sealer is with a micro-fiber applicator or mop. Pour a puddle of the sealer directly onto the floor, and then use a clean, flat micro-fiber applicator to push and pull the sealer across the surface until you get a very thin film.

Be aware that the typical coverage rate for water-based sealers is 400 to 600 square feet per gallon, about 100 to 200 square feet more per gallon than with solvent-based sealers. That’s because water is slower to evaporate than a solvent, giving you more time to spread the sealer into thinner coats. As with any sealer, applying multiple thin coats is always recommended.