Stop A Windshield Crack From Spreading Drill. If you’re up to the challenge, there are repair kits explicitly designed for this. To prevent dust from entering the chipped area, apply a layer of clear scotch tape over it.
If you drill the tip of the crack you essentially start over. Simply give the crack no place to spread by drilling in a small hole at each end with a glass drill bit. If you don’t feel comfortable drilling a small hole through just the top layer of glass, try a different tip to stop a windshield crack from spreading.
Generally, these kits include a windshield adapter and specialized resin that can be forced into the crack.
A very fast (but temporary) way to stop crack propagation is to drill a hole at the crack tip. This will reduce the sif by altering the local tip radius. If the crack is about a foot deep, half an inch broad, or has been there for a prolonged period, you should substitute the windshield with a new and solid one. Again, you should make sure your windshield is fully dry.