tackifier
/ˈtækɪfaɪər/
noun
- A substance added to a material (such as glue, paint, or rubber) to make it stickier or more adhesive.
- The manufacturer added a tackifier to the glue so it would hold better on smooth surfaces.
- Without a tackifier, the rubber seal might not stick firmly to the window frame.
- This paint contains a special tackifier that helps it adhere to plastic.