Now pull back the syringe plunger and then press and push the repair chemical on the chipped part. The plunging process has to be repeated until the syringe is emptied. Give at least half an hour in direct sunlight for the front window repair to sit.
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.).
Let's take a look at why their story doesn't add up. Say you pay $200-$600 for the windshield repair kit. After deducting their cost to manufacture the kit, they will be left with a profit of a certain amount. Now, out of that profit they have to pay advertising expenses and employee's.
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.
If a rock hits your windshield while you are driving when it is already cracked, this can cause it to shatter too and you will not be able to see the road. Dings and scratches generally won't do this but there is always that risk factor that you have to be cautious about.
Windshield cracks and blemishes can be troublesome. You can never really guess what is going to happen; they almost always start small and end up spider webbing across the remaining windshield. Some rock blemishes only leave chunk of glass missing. If not treated correctly it can turn into a large crack as well.
Windshield repair techs come and go on a daily basis. The majority struggle to survive. Most fail. It's not that they're not good at what they do, it's not that they don't have the skills, it's not that they're not willing to work hard, it's their lack of MARKETING Training. That's the bottom line: It all comes down to proper marketing strategies.