Lexel is a copolymer rubber sealant. It has excellent adhesion to a wide variety of materials, even after seven days of immersion in water. Although it is stronger and resists tearing, Lexel is a soft rubber. This allows you to stretch and compress with joint movement. Lexel should not be used in areas of continuous immersion (ie aquariums or swimming pools). Do not use Lexel in areas where temperatures exceed 200 degrees F. Lexel may damage some plastics, such as Styrofoam insulation. Non-listed plastics must be tested for Lexel compatibility prior to general application.