How Often Should I Apply Sealant to Natural Stone?
Most natural stones are porous by nature both on the surface, through the body and into the bottom of the surface. If anything goes in, it will eventually be released so be satisfied that any substance that enters the stone will eventually get out. However, to maintain maximum value and not see any marks, apply a reputable sealant and let it set overnight. The next day, sprinkle water on the surface by hand. If the water is absorbed, apply the sealer again. If the water bubbles on the surface, the sealant is working. As different stones have different absorption rates, check this process on a yearly basis and apply sealer accordingly. Alternately, you may call a service contractor to assist you.