I've done this-- Prep by cleaning with soap and water, dry, rub clean with denatured alcohol, then prep the area with 100 to 200 grit sandpaper. Rub clean again with denatured alcohol. Apply the vinyl sicker. I then spray a one layer coat of Krylon Plastic Fusion Clear UV protectant over the sticker.
Where did you get your vinyl sticker printer paper?--it looks to be better quality than the ones I found at Wmart
Thanks for the info. You don't have to sand it, but doing so does help with adhesion to polyethylene. Krylon plastic fusion Clear UV is available at Wmart and Home Depot. Again, not a necessary step, but does help prevent fading and yellowing due to UV.