I read the directions carefully, followed them to a tee and I thought it was working but in the end failure. The pressure device did not do anything for my star crack after 3 attempts so I used a lighter on the windshield and the fluid moved into the crack so I thought it would work. I moved the car into the sun and by the time the fluid hardened it had moved out of the crack as well. So I kept trying 3 more times reappling fluid and putting the curing pad on it with the car in the sun over and over. Everytime I would use the lighter on the inside of the window it would fill the crack then after an hour in the sun the fluid was hard but it would keep moving out of the crack. Very frustrating and time consuming. After hours of trying no noticable improvement at all. Very dissappointed.