Why do bumpers fade?

Just to clarify; this color shift is only on the top of the front bumper, not the back bumper or on any other horizontal panel; ie, hood, roof, rear deck? Does this car have a turbo kit with an intercooler? Just wondering if engine heat may be causing the color change?
 
No it doesn't.
I would think the hood takes more heat, that's why I
didn't think it was heat.
Maybe I didn't get as much clear on top as I thought?
I usually put on to much, but maybe??
This SS color DOES need clear for protection.
So, as usual, it's probably something I did (LOL)
But at least the rest of the car is doing great.
 
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