Welcome! I have read (and seen in various forums) that the combination of
Meguiar's 105 and 205 polishes really work well on the Benz Black if it need some correction. The final wax/sealant would be up to you! Good luck.
(I'm a real
Meguiar's believer - I would try their
NXT 2.0 sealant - but there are SO many choices out there and most everything is good)