GacoRoof 5 Gallon Black - GR1673-5 100% SILICONE. The unique chemistry of GacoRoof offers peace of mind for a lifetime! It outperforms and outlasts acrylic, urethane, asphalt and Hypalon coatings. WITHSTANDS PERMANENT PONDING WATER. GacoRoof is an excellent choice for flat or sloped roofs. Extremely durable, GacoRoof will not soften, bubble or degrade under permanent ponding water. PREVENTS COSTLY TEAR OFFS. By recoating your weathered roof with GacoRoof, you not only extend the life of your roof, you avoid the need for a time-consuming and costly tear off. NO PRIMER REQUIRED. GacoRoof will adhere to most surfaces without a primer including built up roofs, cap sheet, metal, modified bitumen and sprayed polyurethane foam. NON-SACRIFICIAL. GacoRoof is unaffected by harsh UV rays and temperature extremes.