Indeed! Black hole is supposedly the best to use on black after multiple tests vs other glazes it came out on top for black cars. Fills swirl marks and enhances the black with a more wet/high gloss look. Don't think i would use anything else for glazes.
As for pre wash and wax/sealant I'm still newish myself and testing stuff out. For Me Pre wash is just your generic snow foam and meguiars wash&wax so no help there.
I used a couple of waxes but but best so far is the butter wet wax for me. Great wet look and on top of black hole glaze.. Serious gloss and shine! However black sucks and shows up every imperfection -.-
Also for a quick top up the muc off wax spray is ridiculous wet look gloss shine instantly with just a spray and wipe.
Stu's already linked my thread I told him to have a gander at, shows the products I've been on about in action
I'll keep it updated with new stuff used and the outcomes. Detailing has become my new favourite weekend/day off work job haha.