If windshield repair the source of the noise is the heat shield all you have to do now is to tighten it up. Turn off the engine first then go underneath the car. With your good old screwdriver, tighten all the bolts connected to the heat shield and I mean, every single bolt. While you are already down there, check if the heat shield has been twisted or curved. You can fix a bent heat shield through a pair of pliers or a screwdriver. Pull the heat shield away from the spot where it makes contact with the exhaust pipe.
If the crack looks exactly the same when completed, it's very likely the technician didn't inject the resin properly. A properly completed repair with cause each area of the damage to disappear from at least from one angle of vision (ex: looking from one side, looking from below, looking from above, etc.).
A windshield repair, when done correctly, is the safe choice. But not all damage is repairable. For as many types of debris that exist to damage your windshield, there are as many types of chips and cracks that can result. Some of the most common types of chips have been named.
On most car windows there is a small triangle printed from the manufacturer. Under the fix auto glass repair serial number is a small point with a number. This is the year of manufacture of the window. With popular car models this figure represents the model year. For example a 7 would indicate a model from 1997. If one window has an alternative number it may mean that the window has been replaced due chip or crack damage (windshield) or burglary (side window). If the windshield and side window have a different number from the rest of the windows, this could mean that the car has had a collision. Due to damage the windows have been replaced.
The curing time for the adhesive is one of the areas people pay the least attention to. The adhesive will take time for it to be completely cured. The minimum is a few hours but it is always best to let it stay there without the car moving for at least a day.
Next, will you get the promised support after the sale? Again, do you really think that the support will be top notch considering how much you paid for their kit?
Sometimes, the crack in the Auto Windshield glass is very long and unavoidable. In such cases, its better to replace the glass instead of repairing it. The reason is that in the long run it will be more harmful than the crack itself. It might break in the car itself when you are driving because of the stress.