Silicone Roof Coatings Over Metal: Everything You Need to Know

If you have a metal roof with issues — leaks, rust, failing fasteners — a silicone roof coating system may be the best solution available. Here's everything you need to know.

Why Silicone Works Well on Metal

Silicone coatings adhere directly to metal surfaces and create a fully seamless, waterproof membrane. Unlike traditional metal roof repairs that patch individual problem areas, a silicone coating covers the entire roof in one application — sealing all fasteners, seams, rust spots, and transitions simultaneously.

Preparation Is Critical

A successful silicone installation on metal requires thorough preparation: cleaning the surface of dirt, oxidation, and loose rust; treating rust spots with a rust-inhibiting primer; sealing all fasteners and seams with reinforced fabric tape and sealant; and applying the silicone topcoat at the required mil thickness for warranty coverage.

Benefits of Silicone Over Metal

Silicone coatings are 95% solids, highly UV-resistant, and remain flexible across extreme temperature swings — critical for metal roofs that expand and contract daily. They also reflect solar heat, reducing roof surface temperatures and lowering cooling costs. Warranties of 10–20 years are available depending on coating thickness.

Cost vs. Replacement

A silicone coating restoration typically costs 40–60% less than tearing off and replacing a metal roof. And unlike replacement, there's no disruption from tear-off or risk of exposing your building interior to weather during installation.