SKM Grout Aide Grout and Tile Marker (Parchment) Grout Aide Marker's solution is non-toxic, water resistant and fast drying Low odor so it is safe to use in bathrooms or non-ventilated areas Solution contains both pigment and anti-microbial sealant Mold and mildew resistant and reversible tip for replacing the worn side Each marker covers approx. 175 lineal feet of grout line