Its important to note that the automobile windshield chip repair exterior trim and moldings that we can see on the outside of the glass are for looks only. The actual water seal comes from the "urethane" adhesive which is used to create the bond. Its in this urethane that the water leak is originating.
I have seen this procedure first hand and walked away shaking my head wondering why anyone would want to do this to their windshield. Plus, if you haven't had a new windshield in a while it becomes pitted and is very difficult to see in the sun light or at night. If you have picked up a crack, more than likely it's been hit many times already and is probably pitted.
To change the entire windshield will cost the car owner hundreds of dollars. If they decide to bring the car to a car shop for windshield replacement, they will spend more money. Repairing a windshield at home only takes an hour of dedicated work, and it is extremely easy to repair cracks and chips.
One more repair that can set you behind financially if you don't get done right away is windshield repair. A lot of times our windshields get cracks or chips from road debris that kicks up on the road. If the damaged windshield is taken in for repair promptly, it can be repaired. However if you wait too long you will have to end up buying and replacement windshield and paying to have it installed which is much more costly than a simply repair. Also some shops will offer a mobile service where they will come to you to repair your windshield.
Learn how to perform basic maintenance on your vehicle. It is very easy to do a tune up or change your oil so there really is no reason to bring your car to an auto repair shop to have these things done. Instead, just watch tutorials online to learn what you need to do it on your own.
Dash repair is an art and a craft, just like all automotive interior repairs. If the steps are followed right and patience is used in your repairs you success will be good.