The Nu-Calgon 4296-50 Pan-Spray Leak Sealer and Patch Product is an effective, easy-to-use water proof rubberized coating that won't chip, flake, or peel. It's ideal for sealing out rust and corrosion as well as repairing leaky condensate pans, cooling towers, swamp coolers, roofing, gutters, and down spouts. Pan Spray is the perfect solution for emergency and permanent repair. It is a quick, easy and economical repair on troublesome leaks. Use on condensate pans, swamp coolers, humidifier pans, plumbing and pipe fixtures, roofing, downspouts or gutters. THE NU-CALGON 4296-50 PAN-SPRAY LEAK SEALER AND PATCH PRODUCT IS FOR PROFESSIONAL USE AND SHOULD ONLY BE USED IN ACCORDANCE WITH ALL REGULATIONS AND PROPER SERVICE PRACTICES. PLEASE SEE PRODUCT LABEL OR CONTACT NU-CALGON DIRECTLY FOR USE INSTRUCTION. IT IS RECOMMENDED TO UTILIZE THE APPROPRIETE PPE (PERSONAL PROTECTIVE EQUIPMENT) DURING APPLICATION.