FYI, if your intention is to remove the deflector in the future, there will be a mark. Whenever you cover a part of your car with something, the UV rays from the sun won't hit what's underneath that part as easily. So over time, your car paint will start to fade and the color underneath the hood deflector will not fade as much. So regardless of the adhesive's effects on the paint, you're likely to have a mark if you remove the deflector a few years later. Also, the hood and the deflector are likely to flex and move from heating, engine vibrations and wind buffeting. So I would expect there to be a few scratches or paint rubbing underneath after a few years. Maybe you can remove the scratches and adhesive marks with rubbing compound. But the paint fade will be noticable. Again, this usually takes years, but less time if you live in a sunny area like AZ.I have not installed mine yet. Your post scared me, so I called the manfcturer. They told me that the prep does not harm the paint at all, and can easily and cleanly be removed if you later remove the hood deflector.
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