Miracle Sealants GRTSLRAEROCS Grout Aerosol Spray Penetrating Sealers, 15-Ounce Use indoor or out on sanded or un-sanded new grout, old grout or natural stone multi-hard surfaces Formula designed for maximum stain protection of all cementitious grout Covers up to 250 linear square feet per can and may be applied as little as 2 hours after grouting surface Penetrates and seals grout in a quick, convenient, easy to use spray application Uv transparent, will not yellow and resists weather elements