DAP Kwik Seal Ultra Biscuit is a siliconized acrylic kitchen and bath sealant that provides a durable, water-resistant seal. Kwik Seal Ultra Biscuit is mold and mildew-resistant and provides superior adhesion and flexibility. It is ideal for use on porous surfaces such as ceramic, porcelain, natural stone, and grout. It is available in a 5.5 oz tube.