Clear Phone Cases, Ornaments - Clear Glass, Acrylic, and Wood Signs are printed with UV printing. UV inks bond to tough surfaces highly resistant to scratching and wear and tear. Use care with products that use this printing method. The printed design will hold up with typical usage, but the inks may eventually wear. Avoid scratching or marking the print area, as this will lead to ink removal from the substrate. The inks sit on top of the substrate and do not absorb into the surface.