Duct Seal Compound is an oil-based putty-type material that is used to waterproof and seal electrical connections and around holes and openings where wires and cables pass through, and it helps keep air and moisture out to protect circuitry and other items that might be damaged by exposure to water, dirt, chemicals, etc. The compound is made of non-drying polymers, oils, and inert fillers. The compound is a grey, soft, non-toxic, putty-type compound that adheres to clean dry surfaces such as plastic and metal. It’s easy to use and can be hand-applied at temperatures ranging from 25°F to 120°F.