When rust is encountered on the metal roof of an RV, mobile home, horse trailer or other metal roofs it is essential to use decor metal roof rust inhibitive primer to prepare the roof prior to coating. First remove all surface rust, dirt and debris with a wire brush. Rinse with alcohol, then apply decor rust inhibitive metal primer. It is specifically designed to reduce further corrosion of metal roofs and enhances the adhesion of the decor elastomeric metal RV roof Coating.