The Nu-Calgon 4083-91 DuraCoil Coil and Surface Protectant is a specially formulated coil and surface protectant for HVACR components. The product is an aerosol based, air-dry phenolic gray colored coating designed to extend the life of the coil or other system component in a corrosive environment. The coating is field proven – used successfully by OEMs for many years - but now available through Nu-Calgon as DuraCoil for field service when durable protective coil treatment is required to extend service life. DuraCoil is formulated to extend the service life of the coil or other system component in a corrosive environment. Coils located in coastal regions, industrial/agricultural production settings or refrigeration applications to protect against food acid. Perfect for a new installation if the coil was not factory supplied with a protective coating or to repair an area of an existing coating already in service. THE NU-CALGON 4083-91 DURACOIL COIL AND SURFACE PROTECTANT 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.