I won’t pretend to be an expert here: Sean is the undisputed king of bull$#!& solutions with adhesive. And I say that with respect, as he can generally find a way to stick things together and save tons of time on any given project. Case in point: When I needed to quickly attach a cover plate over a hole in my ceiling — I moved a fixture and might want to move it back — Sean recommended Liquid Nails.
It’s an adhesive designed for construction use, specifically for bonding cabinetry and trim to walls, sticking plywood together, and all sorts of other strange tasks. Though you’ll hear everyone call it simply by the brand name, Liquid Nails actually makes tons of different versions of the stuff, each targeted toward a specific application. In my case I wanted to stick a piece of plexiglass to drywall, so after a little rooting around at the big-box I settled on a plastic-compatible version. (The nice lady at the shop indicated that lots of guys buy it to stick up pieces of plastic crown molding.)
Result: It worked great. A couple of little lines of it on the plexi, a little push and it stuck the first time. Awesome, awesome stuff. Saved me a ton of time with screws or other mechanical attachment methods.
Anyway, totally worth having a tube or two of this around. They sell “small project kits” with little toothpaste-sized tubes of adhesive, but they’re pretty tough to find. I generally have better luck just buying the standard caulk-gun sizes which generally run $2-$5. If you’re careful with it you can use ’em again, and you’ve probably got a caulk gun laying around somewhere, right?