Our 45 resin has the highest lab test results of any low viscosity resin before and after exposure in the industry. This resin is a lower viscosity version of our unbreakable 400 resin. It is used for stone-breaks, in the drilled hole and tapped bullseye at the point of a long crack and as a primer for 1600 or 2400 in the edge area of an edge crack when the glass is below 70 degrees F. Passes and exceeds the ROLAGS mechanical strength requirements. Lab tested temperature resistance is -30 below zero. Like all of our resins, it is moisture resistant. See the Lab Tests proving our resin strength.