Q: do I need to put anything on top of this type of vinyl such as the vinyl shield?
A: Our ColorSpark Permanent Adhesive Vinyl does hold up very well on it's own. But smooth adhesive vinyl is exactly the reason we created Vinyl Shield. I would highly recommend applying ColorSpark Vinyl Shield over the top as that will protect the surface of the Adhesive vinyl from scratches/lifting as well as make it dishwasher safe.
The exception would be our Colorspark Glitter Adhesive vinyls as the Vinyl Shield cannot get a tight bond on the textures.