3M 54620-61801 is a silicone adhesive sealant that can be used to bond, seal, and waterproof multiple surfaces. It features excellent weatherability, UV resistance, and temperature stability, making it suitable for outdoor applications. It is clear in color and will dry to form a tough waterproof coating that resists Saltwater and Chemicals. It is fast curing and resists shrinkage, so it can be used to protect electrical connections, sealing around air-conditioning units, and gasketing.