Rock Chips and Cracks Repaired – Stone damage up to 2 inches in diameter as well as cracks up to 12 inches in length can be repaired. Longer cracks may be repaired under certain conditions. These certain conditions may not allow for a repair to be performed. This would include the degree of damage or position of the damage on the windshield. Best results will happen when the damage is repaired as soon as possible, before weather or dirt can contaminate the damaged area.