How soon after a damage occurs do I need to use UFIXIT DiY Windscreen Repair KitTM?
The sooner you get to any type of windscreen damage the better, to stop it from getting larger. Any damage, no matter how old, can be fixed. Even if there is contamination from dirt and dust, a repair can be completed. Thinking about the size of the dirt particles that you would get in your damage you will struggle to see them once the repair is completed, but it will strengthen your screen and stop the damage from spreading.
