Basically... you need a non-water based contact adhesive. It's messy, and a pain in the butt. That's why Hydro-Turf now has the 3M peel-N-Stick adhesive.
Weldwood contact cement is what we used "back in the day". I still use it if a corner comes loose. A warning, it's a biatch to remove, I can't believe there's not something better out there. The pre-stick stuff is great.
I tossed a full set of hydro turf green (fugly green) mats for the challenger in the can bc they were the old style glue on mats, and I wasn`t fooling around with any contact cement or the like...
I kept a few pieces for projects but thats about it...
didn`t even want the hassle of selling them bc they were glue on... I`m so glad the new ones have the 3M backing... yay!