? [Quick Repair] The air in the crack will hinder the penetration of the repair fluid. We have a vacuum function to quickly remove air from cracks. It allows you to repair more cracks. ;) ? [Long Lasting Effect] The car window can be cured quickly and repair. Note that the scheduling time is about 10 minutes, during which you can press the scheduling multiple times. It does not need repeated maintenance and has long lasting effect. ;) ? [Easy to Use] You can quick fix the car window in few steps. Our glass crack repair tool fluid up to 20pa shear strength, easy to repair small chips, bulls-eye, star-shaped and more. It has strong pressure to force the repair fluid into the crack. ;) ? [Perfect Fix] This windshield repair kit uses the vacuum effect to perfectly cover the damaged part of windshield. It can achieve perfect repair and very to notice the small differences. It restores windshields to near new condition. ;) ? [After-sales] If you have any questions, please get in touch with us, our service team will provide you with a professional and satisfactory service. ;)