Acrylic Adhesive. CAN NOT SHIP AIR,UPS GROUND ONLY. AT-4020 is a specially formulated adhesive for holding all our parts with little or no sagging in vertical or overhead applications. Cures in 10 12 minutes and has working strength within 40 minutes. AT-4020 is recommended for composite and plastic bonding applications and not for bonding to metal substrates. Unlike other 2 part acrylic adhesives AT-4020 has a one year shelf life when stored at 72 degrees but is best refrigerated when ever possible. It is packaged in a 50ml cartridge and can be mixed by hand or by using our AT-300 gun and mixing tips. The 50ml cartridge will bond 150 200 parts. CAN NOT SHIP AIR,UPS GROUND ONLY. AT-4020 is a specially formulated adhesive for holding all our par