Is the crack volatile? How long has it been there? Is it moving?

If there is moisture in the crack it has to be removed, and the best way to do that is with heat, so although I prefer not to submit long cracks to drastic temperature changes I do heat cracks to remove moisture. The important thing to remember here is that you want to warm the glass slowly, and if at all possible warm the entire windshield. Once the glass is warm, concentrate a heat gun tip or torch to dry out the break. CAUTION: This is not for the faint of heart. As most of you know I am not a big fan of using a torch or heat gun on damaged glass, but when it comes to long cracks moisture evaporators just don’t always cut it. However, using a torch or heat gun greatly increases the chance of a crack out, so I strongly suggest that you only use those methods if you have practiced this technique at least a couple of dozen times. Bad weather windshield repairs can be tricky.

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