Nu-Calgon's 4297-75 Pipe-Dri is an Aerosol Insulation which is made to provide a Moisture Barrier, stopping sweating surfaces and dripping on air conditioning lines, refrigeration lines and other cold surfaces. This product separates warm moist air and cold surfaces, while offering the ability to apply easily on odd-shpaed fittings and hard to reach areas. This Pipe-Dri Aerosol should not be used on plastics or painted surfaces.