AC 137 A. C. Tech Adhesion Promoters Polysulfides SEALANT AC ™ -137 Adhesion Promoter AC-137 is an adhesion promoter for AC-251 polysulfide sealant used on metal, polycarbonate, acrylic, glass and/or solvent-resistant coatings. It contains mixed solvents blended with a surfactant, which produce an effective adhesion promoter. Adhesion promoter. Contains mixed solvents blended with a surfactant. Used for polysulfide sealants used on metal, polycarbonate, acrylic, glass and/or solvent-resistant coatings.