It is Zap Adhesives Formula 560 Canopy Glue. It says, Specially formulated to bond Canopies and Plastic parts to wood, figerglass, paint, or MonoKote surfaces. Safely bonds vinyl, ABS, Butyrate, and other plastics.
Forms a firm, flexible clear bond that can withstand shock and vibration.
I will try some on a Robart hinge point and see if it sticks.