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The underlayment should be checked at this time, and any decayed lumber should be replaced. In a coil coating process, the coated steel is first thoroughly cleaned and rinsed so that a uniform surface is provided for a pretreatment phase. The pretreatment is a very thin layer that chemically bonds to the surface of the metal and provides a bonding surface for the subsequent primer and topcoat paint. The primer layer contains corrosion inhibitors and allows for the flexibility of the. Overlap instructions the tuff rib panel may be installed vertically or horizontally on sidewall applications and verti cally on sloped roof applications.