Lower viscosity version of our stronger than glass and unbreakable 400 resin which exceeds the minimum ROLAGS mechancial strength by more than 100%. Good floater crack resin and can be used in the point and middle of an edge crack IF 400 will not fit in the crack. Good resin to practice cracks with for training on (uninstalled) laminated glass in your home. See our practice at home video. Use above 40 degrees F. Like all of our resins 200 is moisture resisitant.