Backing with a dark color is a no-no. Hate to give so muck conflicting advise but black or dark colors always dull the light colors. mask where the white should go, spray the black everywhere else. leave the window masks on, but peel the rest of the masking off. back it with the white. then peel off the window masks and add the tint (in light coats!!!!!) until you like the color. everything else Ricer said goes. good luck!
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