On the 3M Paint Defender spray, here are a bunch of reviews which are decidedly mixed:
http://www.amazon.com/3M-90000-Paint...ews/B00BSKYM82
Lot's of complaints about short longevity and difficulty removing...
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SCCA & Midwestern Council W2W, '91 Spec Miata, '07
NASA TTD Champion, Midwest, '99 M3, '09
Midwstrn Council TT Champion, BS, '10 GTI, '10 &'11
Midwestern Council TT Champion, BS, ‘17 BRZ, ‘19