3M™ Adhesion Promoter 86A is a liquid primer designed to be used with 3M™ Polyurethane Protective Tapes and Boots and other acrylic adhesives to enhance initial adhesion in demanding situations. 3M 86A promoter is designed to promote faster initial adhesion to certain types of surfaces, such as polyurethane paint, epoxy primers or epoxy composites. - 3M 86A promoter is designed to promote faster initial adhesion to certain types of surfaces, such as polyurethane paint, epoxy primers or epoxy composites.