Hydrostop Over Metal

Metal roof coatings restore weathered standing seam, corrugated, and ribbed metal roofs without the cost and disruption of replacement. Coatings Supply carries the GAF coatings approved for metal substrates, including the Premium Acrylic HydroStop system with Spray-Grade Acrylic Flashing for fast horizontal seam treatment (cuts seam labor by roughly 50% versus traditional 3-course detail), and GAF High Solids Silicone for metal roofs that pond.

For rusty steel, prime with GAF Metal Roof Primer. For non-ferrous metals (aluminum, copper, galvanized) or Kynar-coated panels, use GAF Bonding Primer or Multi-Purpose Primer to lock the coating to the substrate. Each system carries 10-, 15-, or 20-year warranty terms depending on coverage rate. Factory-direct shipping from a GAF-authorized distributor.