Miracle Sealants 511, 15 OZ, Spray On Grout Sealer, Unique Formulation Designed For The Protection Of All Types Of Grout, Penetrates Into The Surface & Forms An Invisible Barrier That Is Resistant To Moisture & Stains, Allows Vapor To Escape, Can Be Applied To Freshly Installed Grout As Quickly As 2 Hours After Grouting, UV Transparent & Will Not Yellow Under Any Circumstances.