P-touch and similar label makers are nice--but they are all thermal printers, and the labels will go to 100% black after six months to a year in any kind of warm location, i.e. engine bay. I've even had them go black simply from the heat of the gizmo they were stuck onto (like a radio or tv).
So all that nice work? Is likely to go to waste. Better to use the professional stickers, although some of them also go gummy and fall off after 5+ years.