Why Do Some Sealants Not Stick When Bonding Glass?

Polyurethane sealants are widely used in the glass installation industry. If unqualified glass sealants are used or the operation is wrong, the vehicle may leak, the glass may move, or even the bonding may fail. So, what are the reasons for the glass sealant not sticking?

Let's briefly analyze the possible reasons: 

1. The glass or other bonding base surfaces are not cleaned properly;

   2. The frame bottom glue is cleaned with alcohol or alcohol-containing solvents, resulting in the glue not drying or curing; 

   3. The installation process is overtime, for example: the temperature is too high in summer, more than 10 minutes after glue application, and more than 20 minutes in winter; 

   4. Individual glass or black edges are unqualified, resulting in difficulty in bonding or non-bonding; 

   5. The glue used before is not polyurethane glue, such as silicone glue, and it has not been thoroughly cleaned; 

   6. It is a problem of operation. Uneven glue application leads to leakage and debonding in the blank area; 

   7. The non-self-adhesiveness of the car glass glue itself (the glue used is not suitable, the wrong glue is used), etc.