Pro Primer LD is a high-performance, moisture-cured, polyurethane-based substrate penetrating primer for use in conjunction with Paraflex Systems. Used where metal roof panels are to be treated prior to Paraflex application, Pro Primer LD is used for corrosion protection and as an adhesion-promoter for steel, aluminum, and galvanized metal surfaces. Pro Primer LD can be used over sound, rusted metal substrates where sandblasting or mechanical abrasion is not possible.