The Best Adhesive Sealant in QLD. The adhesive sealant is a type of material used to bond surfaces together and provide a watertight or airtight seal. It combines the properties of both adhesives and sealants, making it versatile for various applications. Adhesive sealants are typically composed of a base material, such as silicone, polyurethane, epoxy, or other polymers, and they may include additives like fillers, curing agents, and solvents depending on the specific product and its intended use.