Sealers for Stamped Concrete
The final step in the installation of stamped concrete is to apply a sealer suitable for exterior exposure conditions. Sealers provide several important benefits:
How to choose the right sealerThe primary type of sealer used for exterior stamped concrete flatwork is a solvent- or water-based acrylic. Acrylic sealers are easy to apply, economical, and most important, breathable, allowing moisture in the slab to escape. They also are UV resistant and non-yellowing. Solvent-based acrylics generally perform better than water-based products for outdoor use because they penetrate well and are less likely to turn white, or milky. (Learn more about acrylic sealers.)
Before buying a sealer, check with the manufacturer to make sure the product is appropriate for your particular project. Here are some important questions to ask:
How to apply sealer to stampedBefore applying sealer to stamped concrete, the surface must be clean and dry to ensure good adhesion. Also, you should allow the concrete to cure sufficiently -- generally several weeks after placement, depending on weather conditions. With stamped concrete, it’s especially important to make sure the surface is free of moisture in low spots of the stamp pattern, where water may accumulate.
There are several tools you can use to apply sealer to stamped concrete, depending on the product you’re using. Pump-up or low-pressure sprayers are best for applying one-part, solvent-based sealers with a solids content below 35%. Airless, or low-pressure high-volume (LPHV) sprayers, can handle both water- and solvent-based sealers and permit very controlled application rates, allowing large areas to be sealed in the shortest time. You can also apply water- or solvent-based sealers with a paint-type roller. To work the sealer into the textured surface and stamp pattern depressions, be sure to use a roller with a fairly thick nap (about 3/8 inch). One of the best application techniques when sealing stamped or textured surfaces is to combine spraying followed back rolling to keep the sealer from settling in low spots and to help distribute the sealer uniformly.
Learn more about choosing the best applicator for concrete sealer.
Stamped concrete sealer dos and don’ts
For more information on concrete sealer application and troubleshooting, see Fixing Common Sealer Problems.