UNBREAKABLE in lab tests and a rollover crash. Number One selling long crack resin in the world along with our 400 and the first long crack resin that worked. This resin changed the industry in 1990. Windshield glass cracked edge to edge and repaired with 1600 passes the same federal motor vehicle safety standard (FMVSS 205) as a new windshield for strength, visibilty, impact and penetration resistance. 1600 has even held-up in a real-world rollover crash without breaking (see the story and photographs on our home page). Mechanical Strength is 152% of new glass.That means that a windshield with a repaired crack with 1600 resin is 52% stronger than a new windshield. Loses no strength from QUV weathering, temperature cycling to -30 F to 225 F or thermal cycling. Meets and far exeeds the auto glass industry's Repair of Laminated Auto Glass Standard (ROLAGS) resin criteron. Use in the middle and edge section of edge cracks with 400 in the point and middle where the 1600 stops. see our video instruction page.