If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension: : C; l: |3 ]2 z# E# P; m% x9 w" t1 R) u7 r# @* p4 ]& c
(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot' L8 u; o6 A1 Q S
. [, q' v4 K4 N( _; H8 G" ~0 v1 `(2) To buy a round or square think-glass-disk with diameter or side length of 1 inch. If you can't find it, you can go 99 cents stores or dollartree to buy a large-clear-cloth-button at similar size. 0 f; d# Q& }, s; q $ X: P6 o9 n O. l(3) Prepare Epoxy well, spread the paste to one side of the glass or button, attach it to the crack-upper-end from inside of windshield. Wait for 24 hrs. It'll be as solid as a rock and permanently stop the crack extension.