Aqua Mix Grout Colorant - 8 oz Bottle - Light Gray Aqua Mix Grout Colorant is a waterborne epoxy that re-colors and seals grout joints Restores discolored grout, creates a colorful new look, and even changes dark colors to light Ideal for rejuvenating old, dirty, worn grout, in both interior and exterior locations Features user friendly, easy-to-use application and clean-up Vibrant color lasts up to 15 years