RCD Corporation® #20 Clear Adhesive Sealant is a clear construction adhesive-sealant and gasketing material that applies white and dries clear. Widely used as a form in place gasket for sealing grills and registers when they are installed in residential or commercial buildings. RCD Corporation #20 Adhesive-Gasket-Sealant remains flexible for the life of the seal and withstands 50%  total joint movement.