What term means the clinging or sticking together of two surfaces?

• A. Aging
• B. Bead
• C. Adhesion
• D. Bite

Answer: (C)

Adhesion is the clinging of different materials to each other, the force that makes two surfaces stick at their interface. This concept matters in windshield replacement because a strong, well-adhered bond between the glass and the urethane sealant is what keeps the windshield in place and prevents leaks or wind noise. Achieving good adhesion depends on surface cleanliness, dry conditions, proper preparation, and compatible materials so the adhesive can wet and bond to both surfaces. If adhesion is not achieved, you can end up with gaps, leaks, or a weak bond that may fail under stress. The other terms don’t describe the sticking-together relationship: aging refers to wear over time, a bead describes a line of material applied, and bite isn’t related to surface bonding.