Thanks for all the suggestions so far.
A few people mentioned adhesive backed UHMW tapes. How do they get the tape adhesive to stick to the UHMW?
BTW, I don't want to buy anything if I can help it. I have a small piece of UHMW that is about 3/4 x 1/2 x 6 inches long. I wanted to slice it thin on my bandsaw ( making a 3/4 x 1/8 x 6" piece ), cut it into three 2" long pieces, and adhere them onto the bottom of a piece of aluminum runner in a table saw jig.
I have some different spray adhesives including the 3M #77 that someone mentioned (I think), and some "industrial" contact cement. May try that too. And maybe a piece of carpet tape or some other double back tape.
Wayne