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Coating a metal RV, trailer, or mobile-home roof only works if the surface is prepped right, and bare or rusty metal needs a primer first. This Dicor rust-inhibitive primer is formulated to slow further corrosion and give the acrylic topcoat a surface it can really grab onto.
After you knock off loose rust and debris with a wire brush and clean the surface, brush or roll this arctic-white acrylic primer on. It dries to the touch in about two hours and covers roughly 50 square feet per quart, prepping the roof for Dicor's elastomeric metal roof coating.
The right first step for a metal-roof coating job that actually holds up.