The area of the substrate in contact with the sealant must be kept clean, dry, and free from dust, dirt, rust, grease, and other contaminants. Non-porous substrates must be cleaned with a clean white lint-free cotton cloth and solvent. Before the residual solvent evaporates, wipe it off with a clean dry cloth as soon as possible. Before sizing, cut the nozzle of the rubber tube first, install the glue nozzle, and cut the nozzle to the required size. The sealant can be coated in dots or layers, and needs to be exposed to moisture in the air to cure.