The 3M clear bra on my Arctic Silver CS has started to turn slightly yellow after just 6 months. The car is garaged except when out on the road. It's noticeable only in certain lighting conditions, but it is there if you look for it. It's not enough to make me want to take it off because I think it's the lesser of two evils. On my last Porsche (a 944 Turbo) the nose of the car (without a bra) accumulated lots of small pits over the years from road debris. Based on that experience I opted for a clear bra for the Cayman.

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John
'07 Cayman S
'89 944 Turbo - sold
'05 Saab 9-5 Aero