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Meguiar's Ultimate Polish.
You can do that combo with nothing in between the two. UC has enough oils in it to finish down really well and Blacklight is a great glaze to top off the paint.
Are you going to put anything over top of Blacklight?
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It depends on how your paint responds.
Check your work after the UC (preferably in the sun) and check for any marring / hazing. If you have some, or if the clarity is not as good as you would like, then got to something like Megs UP (as suggested) before the BL.