Specifications include, but are not limited to: Contractor’s employees shall be certified by the National Auto Glass Association to install and repair windshields. 2.2. All vehicles requiring auto glass replacement are to be returned to the manufacturer’s original and intended safety levels. 2.2.1.Exception: For auto glass replacement in temperatures below 40 degrees F, technicians must utilize original equipment manufacturer approved two-part chemical cured urethane that meets the following criteria: 2.2.2.Documented proof that the urethane used will reach 250 psi of lap shear strength in one hour down to zero degrees F. 2.2.3.Proof of purchase seals – lot numbers of all associated urethanes and primers must be listed on each invoice for additional proof of use.