Miracle Sealants GRTPENBUF6 Grout Pen Color & Gloss Enhancers, Buff Use indoors or out, apply over existing grout or mold and mildew stains to renew grout lines Odorless, non-toxic formula offers safe application with no fumes or chemicals Covers up to 175 linear feet of average grout and dries to touch in 45-60 minutes Easy to use grout pen features a non-slip comfort grip for ultimate control and reversible nib Available in 2 popular colors for a clean, uniform finish