3M™ Scotch-Weld™ Acrylic Adhesive Accelerator A3-2 is the accelerator (Part A) of a two-part acrylic adhesive, engineered to be used with a B/A system. We designed this accelerator for use with our 3M™ Scotch-Weld™ Acrylic Adhesives in the DP8600, DP8700 and DP8900 Series. The fast rate of cure provides rapid strength build-up and produces tough, impact-resistant bonds.