Why Auto Glass Repairs Sometimes Fail
To understand why auto glass repairs do fail sometimes, despite best efforts, you
first need to understand how the process works. The damaged area is cleaned out
and filled with a liquid resin that bonds to the break in the glass- causing it to be
stronger than if it were left unrepaired. As the resin is injected with force and using a
vacuum tool, the air in the glass is forced out and replaced with the chemical, which
fuses with the broken glass to create a near-invisible fix. This is then dried out using
UV light, and appears almost blemish free after it is done.
While most of the time this does solve your problems, there are a few instances in
which it doesn't work. Why does this happen?
Most commonly, repairs fail because the crack may have been too long to be safely
repaired. Long cracks of over 5 inches can sometimes be patched up, but in most
cases the results are not up to the mark and will not last. The location of the crack is
also important- if it is too much to the side of the windscreen, then it is practically not
possible to fix and should not be attempted. The technician should be able to judge
through his experience whether the crack is of a suitable size and location for fixing.
Human error is the other most common cause of a failed procedure. If the technician
does not have sufficient experience, then he may not be confident about what he
is doing. Usually a junior technician would work as an apprentice under a senior
person, till he gets the hang of it. Make sure that you pick an Auto Glass company
that has experienced workers, and has received good reviews from past customers.
An experienced technician will know that the crack needs to be cleaned out well
before an attempt is made to fix it. If there is any contamination in the crack, it will
not take the procedure well. Rain water that has entered the crack has possibly
carried dirt and grime into it, which will prevent the resin from fusing well with the
glass. Sometimes wax may also enter the crack, or special products which may have
been applied to the glass to enhance its appearance. These chemicals will totally
repel the resin and prevent bonding.
This is why vehicle owners are advised to cover the chipped area with scotch tape
or duct tape as soon as possible after the damage has occurred. The tape will help
keep the glass clean until it can be attended to.
Another reason why this could fail is if substandard products are used for the
grouting. Minor chips can be fixed using a low viscosity resin, but if the crack is deep
then a resin of industrial strength should be used. The right tools must be used for
the process- these include a vacuum and injector of good quality.
Finally, after applying the resin, the curing that is done must be performed using an
ultra violet light- this process should not be speeded up, as if the resin doesn't dry
out properly then the setting process is not complete. Make sure you don't try to
hurry up your technician- he knows what he is doing better than you do!
When properly executed by experienced technicians using the right materials, a
crack repair can last for several years and will save your vehicle glass from further
damage. Don't delay- get it seen to at the earliest!