LOCTITE 770 Primer For Instant Adhesives - 10 gAdhesion promoter formulated for use with compatible cyanoacrylate (instant) adhesives to improve bonding performance on low surface energy plastics. Commonly used on substrates such as polypropylene (PP), polyethylene (PE), PTFE, and certain rubber materials where standard instant adhesives may exhibit reduced adhesion. LOCTITE 770 is applied to the substrate surface prior to adhesive application, enhancing bond strength and reliability on difficult