When should contaminants be removed from the pinchweld?

Contaminants should be removed from the pinchweld before trimming the existing urethane. This process is crucial because the pinchweld is the area where the new adhesive will bond to the vehicle's frame. If contaminants such as dirt, dust, or old adhesive residues are present, they can adversely affect the adhesion quality of the new urethane. Ensuring that the pinchweld is clean before any trimming takes place allows for a better bonding surface that can improve the integrity and safety of the windshield installation.

Removing contaminants at this stage is proactive and helps in achieving a strong, durable bond between the new urethane and the vehicle's structure, reducing the risk of leaks and ensuring that the windshield is properly secured. Addressing this cleanliness standard beforehand aligns with industry best practices for a successful installation.