Windshield Repair Tips

Frequently Asked Questions on Windshield Repair

You’ve got questions and we’ve got answers! Here are some of the more common questions we get from glass repair technicians.

What can I do to make my seals last longer?
Make sure you clean your seals at the end of your day and disassemble your injector (remove the piston from the body). Clean your seals with denatured alcohol. Also, when you disassemble your injector make sure the end with the white seal is pointing downward rather than up. This way resin will not get into the upper chamber. The mixture of resin and injector seal lube will cause the upper seal to swell up quickly.

What is the coldest temperature that I can do a repair? Will resin freeze?
Even though the optimum repair temperature is between 60 and 90 degrees Fahrenheit, you can perform a repair at any temperature. In colder temperatures, it may take longer for the resin to flow into the damage, make sure you use the thin resin. The resin will not freeze.

What happens if I use a different company’s resin in GlasWeld equipment?
Some resins on the market contain chemical compounds that are hard on the seals and will cause them to swell or deteriorate; therefore, the lifetime warranty on the equipment is dependent on using genuine GlasWeld resins. If you use another company’s resin, it will void the warranty.

Why can’t I use resin in the final pit instead of pit filler?
Pit filler resists moisture. If you use resin, the moisture can migrate through the resin into the repaired area causing the resin to break down and compromise your repair. Also, the pit filler is designed to polish up shinier and be less visible. If you use resin, the damaged area would be more visible.

Why does the length of time the damage has been present effect the ability to do a repair on it?
If a windshield has been damaged for a longer length of time and the car owner has been driving with it, there is a higher possibility of dirt and road oil getting inside of the damage. These foreign agents cannot be removed from the break. Even when you remove the moisture through evaporation the dirt will be left behind. Your repair would be secure but not have clear visibility.

Why does GlasWeld have me cure with the injector still on the glass in the pressure cycle?
Resin shrinks as it cures. If it is still on the pressure cycle then more resin can enter the break to take the place of the shrunken resin.

How will I know if a seal is bad?
If the upper seal is bad, the operation of the injector will feel spongy, or the injector will no longer hold a vacuum. If the lower piston seal is bad, your repairs will not fill because the resin will go past the seal instead of into the damage. If the outer white seal is bad, resin will leak down the glass, or the injector will not hold a vacuum.

Why shouldn’t I use the sun to cure?
The amount of time it takes to cure is not consistent during different times of the day, different seasons, and different locations. You will not know if your repair has been properly cured.

What kind of damage should not be repaired?
Damage on the inside layer of the laminated glass, damage with three or more long cracks coming from a single point, damage with visible impurities, edge cracks that intersect more than one edge and stress cracks.