1. Technical principle Vacuum infiltration + optical curing: Remove the air inside the crack by negative vacuum (pressure -0.08MPa) and inject high transparency epoxy resin. Fast UV curing (10 minutes), resin hardness up to Shore D75, impact resistance up to 30%. 2. 2. Repair range Repairable types: Star-shaped cracks (diameter 5cm), bull's-eye breaks (depth 1.5mm), composite damage (not penetrating the glass interlayer). Non-repairable types: Penetrating cracks, broken glass edges (easy to lead to secondary cracking). 3. Precautions Avoid washing the car within 24 hours after repair and avoid extreme temperature differences for 7 days. Check the integrity of the repaired area annually, if yellowing or crack expansion occurs it needs to be repaired again.