If you’ve heard of P21s, they have a wax that works wonders. My wife uses it on her car because it really really compliments dark colors, and black is definitely a challenge. The wax is $31 per container, and it’s 100% carnauba, so it’s high shine.
For the sealant, did you mean for your paint? Sorry, you said it after the leather cleaner so I wanted to make sure…I know you know that though.