Portersept® HVAC Acrylic Primer/Finish is a high quality, interior, high hiding, waterborne acrylic primer/finish that contains Intersept®, an agent which inhibits the growth of mold and mildew on the surface of the paint film. Specially formulated for application to the interior surfaces of HVAC ducts (lined and unlined), plenums, fan assemblies, air intakes, baffles, dampers and miscellaneous system components, it is suitable for application to galvanized steel, wood, insulation, and properly primed iron, steel, aluminum and copper.