Hey folks,
I've been having difficulty applying vinyl lettering - mostly the larger fonts and/or graphics to our painted, smooth concrete interior that I have not experienced previously.
The applied vinyl has just peeled right off on its own within 24 hours, sometimes landing on the floor, sometime dangling like an old sock on a clothesline.
My supplier sent me a second set of vinyl which, although it held better, did begin to peel.
The supplier claims nothing is wrong. But as I wrote earlier, this has not happened before in applying their vinyl products to the same area.

I eventually solved the problem by using brushed on rubber cement in a "contact adhesive" way. That is, putting the cement on both surfaces to be glued, letting the cement dry and then pressing the two items together. This has actually solved my problem.

Maybe my experience can help some one with a similar frustrating issue.