In order to print on these label stocks, you'll need to use special printing methods involving ultraviolet curing. Special equipment and ink are also required to print on these types of label stock.
You can also print labels directly on adhesive, but these won't last long. The ink that you purchase for labels printing will depend upon the label stock that you use. Some plastics become more receptive to adhesives and inks after flame treating or corona treating, which reduces the surface tension of the material.