Just a question, would the Dupont primer work/help? I use the primer every time I am going to stick something to the black plastic. I did not use this with the Dragon stickers and just used alcohol and they would not stay on.
I use also a Primer and yes it helps, but some of the parts are just a few millimeter (sorry I'm a metrics guy) and the surface of the splash guard is not smooth. I would cut the transparent vinyl to the outside dimensions of the decal.