AP3155 Adhesion Promoter for Hard to Print Substrates; Glass, Alum, Acrylic, Metal, Liter Bottle AP3155 is an adhesion promoter for use with UV and LED curable inks Used when printing on glass, metal, aluminum, acrylics, HDPE, coroplast, polystyrene, and other hard to print substrates Suitable for both interior and exterior applications UV Printer Adhesion Promoter