1: PRO TOOL: Professional-like quality DIY windshield crack and chip repair system; no mixing required; repairs small cracks and rock chips in under 10 minutes; prevents damage from spreading 2. LIKE NEW: The resin, when applied correctly, helps to restore windshield to near brand-new state; the RockPro system is perfect for bulls-eye cracks, spider webs and star damage patterns, and some smaller diameter combination breaks. 3. HOT AND COLD: Two distinct formulas – hot and cold; Hot cartridges work best in 75o F (24o Celsius) or higher, and Cold cartridges work better in 75o F (24o Celsius) or under. 4. EASY HANDLING: Clean and dry the glass surface before repair; apply the resin into the break with the RockPro system following the detailed instructions, apply a curing strip (included), then let dry and solidify under ultraviolet light 5-10 mins. Finally, scrape off the residual resin with a razor blade (included). 5. COMPLETE SOLUTION: The RockPro system is meant to be reused - the Resin Cartridges come as single units, or in combinations of 2 Hot Cartridges and 1 Cold Cartridge, or 2 Cold Cartridges and 1 Hot Cartridge (Pit Filter and Plastic curing strips included). Product description The Easiest and Fastest Way to Repair Your Windshield RockPro’s Windshield Repair system is the perfect tool for repairing small damages in laminated automotive glass windshields. The RockPro resin helps prevents chips and cracks from expanding in both hot and cold climates: hot cartridges work best in 75o F (24o Celsius) or higher, and cold cartridges work better in 75o F (24o Celsius) or under. Avoid the hassle of taking your car to the shop for glass replacement or from having to fill out insurance information. The materials used in the RockPro repair system create a sturdy and durable fix for most rock chips and small cracks. The RockPro system is a time and cost effective way to have you back on the road without having to look through dangerous and unsightly breaks.