This Coloured Merkrete caulk comes in a 10.3 oz tube, Sandstone Color Line, and should be applied using a caulking gun. ColorFast tile and grout caulk is made of siliconized acrylic latex. This siliconized acrylic latex caulk is available in both unsanded and sanded versions. The caulk can be used to seal backsplashes, windows, tubs, and sinks in both indoor and outdoor installations. Mildew, moisture, and UV rays are all resistant to siliconized acrylic latex caulk. After it has fully cured, the ColorFast tile and grout caulk color will not wash out due to any harsh weather or water contact.