An adhesive is a natural or synthetic, organic or inorganic substance that joins two or more parts or materials through interfacial adhesion and internal cohesion. The term covers products such as glues, mastics, adhesive slurries, and pastes.

Silicone sealant is a paste-like material that cures into a tough, rubber-like solid upon exposure to moisture in the air. Types include acetoxy, alkoxy, amine-type, and acetone-type systems. It is commonly used to bond and seal glass. One-component silicone glazing sealant is a paste-like material that cures into a tough, rubber-like solid upon exposure to atmospheric moisture.