long crack repair? why the frell are you wasting your time? thats why they replace windshields. there is no system out there that can repair any chip or crack and make it so you can not see the crack. even repaired, it's still broken. just my two cents worth, and by the way, if you wondering, i have been done this for years, 13 to be exact....

Covering more ground than Lewis and Clark........</p>