mine has been on for 1 year (and my car sits outside 24/7) and I see no discoloration or anything. Still looks perfect. I do use spray wax all the time on it and very 3 months or so I do a complete buffer wax.
Those prices you were quoted are dead cheap. My bumper was 600, full hood (i highly recommend full) 450, Full roof was 300, half fendors 295, a pillar, rocker panel, mirrors, some other small parts...like another 200. IDK...it was a little under 2k. The guy did an amazing job and I would go back again on my next car.
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2009 370z 6MT Touring w/ Sport Pkg | Invidia Gemini CBE| Stillen G3 CAI | ERZ HFC's |X-Pel Clear Bra | 20% Tint
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