How Deep Do You Drill To Repair Cracked Windshield?

How Deep Do You Drill To Repair Cracked Windshield? Drilling a maximum 1/8-inch into the glass is a safe depth to prevent additional splintering or cracking. Drilling creates a vacuous gap allowing residual air pressure to release. Place 10 droplets of curing resin into the hole. Allow resin to dry for at least two hours.