Yes I have full PPF which was installed two weeks ago, and I'm seriously OCD. LOL I installed an RPM spoiler 3 years ago on my Model 3 with only the tape and it has been secure all that time. I remember laying it down with just the tape and the minute it touched, it felt like it was welded on. The 3M adhesion promoter technical sheet does say that it might require "vigorous rubbing" in order to get it off (I know....that's what "she" said).
After hearing what you said, I may forgo the adhesion promoter in case one day I don't want the spoiler and so I don't need to risk staining the PPF or creating a mess.
I was playing around with positioning the RPM Performance Plus spoiler on my Y last night, and what I found is that you need to really carefully play with the positioning of it in order to make sure all areas lie completely flat on the trunk. One mm too high or too low, and it doesn't hug the contour of the trunk. Today when I install, I plan to position it and then tape it down on the top to act like a hinge so it doesn't shift. Then I will pull the bottom tab first to lock the spoiler to the vertical part of the trunk, and then remove the "hinge" tape on the top so I can then pull the top tab and lock the rest of the spoiler down. That's the plan. On my Model 3, I almost ripped the red tape tabs because I had pulled them in the opposite direction, getting them caught. This time I will be much smarter about it.
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