Answer: Tempered glass detonates spontaneously due to the stones, crash, or nickel sulfide crystals inside or due to bursts and deep chips. Scratch repair does change itsthickness but such change is not so serious as the above causes of spontaneous detonation. Consequence unknown, the repair of very serious burns (e.g., the depth of burn is one quarter of the glass thickness) is an exception. For this reason, repairing general scratches is safe, without an impact on the stability of tempered glass. Please feel free to use the kit.