Was just reading topic and thought I would give my $0.02. Been using contact cement from Menards for years for custom upholstery jobs. Comes in gallon or quart sizes. Get the stinky stuff, not the water based stuff. Have used old LVHP (not HVLP) paint guns to apply (us in very well ventilated area or wear respirator!), coat both pieces, allow to dry and press together. Have also done many simulated rag tops and vinyl tops using same technique. Pic is of recent project - padded roof with cutout, vinyl & neon.