In my experience, Klasse is the tops for black cars. The sealant will "hide" many swirl marks very nicely. With the sealant, the more coats you use the greater the hiding effect and the deeper the color gets.
On swirl marks, if you are handy with a buffer, Meguiers makes a nice swirl mark remover that does remove SOME of the marks, depending on what you are starting with. After using that, proceed with the Klasse All in one and then sealant.
Good luck!
PS-Black is just plain tough to get right.
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