What goes into a metal roof coating, and why does it stop leaks?
Most metal roof coatings are elastomeric liquids, such as silicone or acrylic, that dry into a rubbery film thick enough to bridge small gaps at screws and laps. The film stretches as steel panels expand on hot afternoons and shrinks back overnight.
On an R-panel roof, crews treat the weak points first: every fastener head, each end lap, the ridge cap and the trim at the eaves. Those details get sealant or fabric-reinforced coating. The open field is then coated in one or more passes until it reaches the thickness the manufacturer calls for.
