Change the color of your asphalt shingles without the painted look! Shingle-Lok is a waterborne emulsion developed to prolong the life of asphalt shingles by absorbing into the substrate for a natural look. It provides lasting weather protection for both old and new roofs, inhibits algae growth, and reduces granule loss. The unique formulation resists peeling, cracking and chipping while colors remain vibrant and fade resistant.