550 Water based Polyurethane Concrete Countertop Sealer is a glossy, two-component urethane resin that provides a clear, long-lasting finish. Polyurethane coatings are highly durable, easy-to-apply and suitable for both indoor and outdoor use. The Part “A” component must be thoroughly mixed into the Part “B” component for the material to properly cure and harden.
Coverage: When properly applied to a smooth surface, the mini kit will cover up to 60-75 sq. ft. Coverage will vary with surface conditions and concrete porosity. Proper ventilation to the outside is required while applying. For best results, apply sealer at temperatures between 60F-95F and when the relative humidity is 80% or less. The sealer itself must be above 60F before installing.
Mixing Instructions: As a two-part system, Part A must be thoroughly mixed into Part B in order for the material to properly set up for application. Pour Part A into Part B and begin to mix with a paint stir stick. Mix completely; fold the material over onto itself and carefully scrape the sides of the can to assure nothing is left unmixed. The contents should thicken and become whiter as you stir. Stir for 2-4 minutes until totally combined. Once mixed, the pot life for the sealer is 1 hour. Working the material after the recommended time can result in streaking and an uneven finish.
Countertop Application: Use a piece of packing or duct tape to “de-fuzz” the 3/8” nap roller prior to application. Pour a small amount of sealer onto the countertop surface careful to avoid dripping sealer over the edges. Using a 5 mil notched squeegee begin to gauge an even coat depth by pulling the squeegee across the face of the countertop. Pour more sealer as needed to cover and gauge the entire surface. With the handheld roller, gently roll the sealer into place against the squeegee application lines. Roll again in the opposite direction. Carefully wet the roller with sealer and apply along the edges without dripping or overlapping the countertop face. Do not attempt a second wet coat as this can lead to overworking and foaming. Working time for this material is 5-8 minutes after pouring the sealer on the countertop. Applying beyond the recommended working time can result in streaking, a milky appearance and/or an uneven finish.
If a second coat should be deemed necessary, apply within 24 hours of the first coat or wet-sand the surface with a 600 grit pad prior application to ensure good adhesion. Surfaces sealed with 550 should cure for 12 hours at approximately 75°F before use. Allow for additional drying time if high humidity is a factor. 550 Water-Based Polyurethane Sealer can also be applied with HVLP Gravity Feed Spray Gun for finer finish. Dilute sealer by 25% with water and spray. Compressed air required.
550 can be cleaned prior to cure with isopropyl alcohol. The sealer can only be removed from fully-cured concrete surfaces using industrial paint strippers, such as Soy Gel Paint and Sealer Stripper, or by mechanical means, such as grinding or sanding. Leftover product, brushes, paint trays, or roller covers should be responsibly discarded after use. Clean countertop surfaces with a mild dishwashing soap and water.
Key 550 Water Based Polyurethane Sealer Features:
• Highly durable, glossy, no-wax finish for indoor countertops
• Add a 5 mil squeegee for an even depth and perfect finish
• Suitable for any exterior/interior countertop project
• Can be applied with a roller or HVLP sprayer gun
• VOC compliant everywhere but California