KAD and K51 are two different colors there are several variants for each code referred to as alternates the code is to get the painter to a starting point and then he tints the color to match.
And as far as using the gas door not a good choice that being plastic the metallic lays down different on plastic than metal and the plastic absorbs the paint where as metal doesn't.
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2013 ZL1
754 rwhp 747 rwtq 
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