This product is intended for quartz surfaces, which are non-porous, however, some amount of sealant does soak into the surface, and may require repeated re-application. Per instructions, the surface should remain wet for about 3 minutes after the application. After 5 minutes, the remainder of the sealant wiped clean, and there was no residue left. I chose to wait a few hours before using the countertop again, but according to the manufacturer, the surface can be used after as little as 20 minutes. With this sealant was applied, I have not noticed any stains developing, so the product appears to work as advertised.
