I purchased my business and was trained by a 23-yr repair veteran. I watched him do long crack repairs in which the crack seemed to disappear and they seemed to last forever. His technique was to run a 5-inch bead of med-resin over the crack, then put a piece of curing film over it, then another bead.... He would then use a Bic lighter to heat the windshield from the inside and would use his knuckle to put pressure on the crack from the inside. When the glass cooled and the glass retracted (from its heated expansion) the resin flowed into the crack... aided by his knuckle pressure.
He would remove air bubbles by putting an injector (sans the bridge) over the bubbles and would twist-suction the injector. After doing this a few times... all the air bubbles were out and the window looked great.
I have read about and practiced sliding the bridge and injector along the crack.... but have had about as much success as with my trainer's method. I am sure a 10-year veteran of either method can do a great job.. and yes, I know that that resin is better than this resin...etc... but why do newbies like me (3,000 chips) have trouble filling cracks? More tips from you old timers?
