Before sealing grout or natural stone the area needs to be properly cleaned, the only exception to this is new installation. Most homeowners over look the sealing process but, it can be an important one, it determines the longevity and can preserve the lifespan of your grout and natural stone. Another method to sealing is grout color sealing also known as grout stain, where we can apply a color sealant to your grout and change the appearance of your tiled surface.