LOCTITE SF 737 is an Activator for LOCTITE® toughened acrylic adhesives with Substituted dihydropyridine. It's looks Amber liquid with low viscosity. It is used for large gaps (>0.4 mm) or where maximum cure speed is required then treatment of both surfaces is recommended. It will not dry and will remain active for up to 6 hours. Bond assembly should be completed within this time.