LOCTITE SF 770 is a primer for the fabrication of hydrocarbon and other low energy surfaces and is suitable for bonding with LOCTITE Instant Adhesives. This product is only recommended for difficult-to-bond substrates, including polyethylene, polypropylene, polytetrafluoroethylene (PTFE), and thermoplastic rubber materials. LOCTITE SF 770 is not recommended for use in assemblies requiring high peel strength.