Apply above 50F (10C). Clean and dry surface thoroughly. Waxed surfaces should be stripped. Use lacquer thinner or rubbing alcohol to remove grease and oil. Prime porous or unfinished surfaces with contact adhesive. Cut to length with rounded corners. Remove backing and press firmly working toward edges. Make certain all edges are adhered. Cut two pieces and apply on either side of crack or grout lines. Do not apply in areas that are continuously under water, such as swimming pools or spas