J-B Weld's silicone sealants take the place of conventional paper, cork or rubber gaskets and usually are described as RTV (Room Temperature Vulcanizing).Vulcanizing is the process that cures the rubber in the sealant and usually requires high temperatures.Whether you're doing a small repair or tackling a large project, we have all the products you need to get the job done right.Explore our entire product family.No matter which product you choose, you always get the legendary performance of the world's strongest bond.