How does it work sticking to plastic, especially that slightly textured plastic on small engine covers and such? Do you need to wipe the plastic and/or parts down with anything in particular before applying the pressure sensitive film?
Mike.
Sticking to plastic is usually OK, although polyolefins like LDPE or polypropylene aren't the best. Texture can be a problem, but the result will ultimately depends on how much there is. The more grain, the worse for sticking. Pebble grains are not great for this method. Some leather grains are OK.
If the original maker put a sticker on a noticeably textured part, they too are asking for problems. Many times the tooling will have a smooth area where the stickers go, and if there's a bit of oversized margin, an overlay can work there.
I don't worry too much about surface preparation, although I'll often Windex or isopropyl alcohol wipe the surface. It's really frustrating to overlay something with **** under the plastic, so cleanliness is good for aesthetics as much as adhesion.
I've done this to protect things like serial numbers and safety information. Is that OCD? Well, maybe... but I can look up service details on old stuff and I still have all my fingers...