I love solid black! The best colour for flattering your machine polishing when you get it right, and punishing it when you get it wrong! My favourite colour to detail
The ultimate key to getting be best out of flat black is the same as all colours, but even more important here: prep, prep, prep!! Machine polishing the finish with a fine finishing polish to burnish it to a high gloss - you'll get excellent clarity, and deep mirror like reflections from the colour that really will stand out in a crowd (IMHO).
One prepped, its like always: the
LSP choice doesn't matter all that much. Sealents will help the reflectiveness, waxes will deepen the gloss a little: take your pick. After thorough machine polishing preparation, this solid black Golf received Clearkote Yellow Cream Wax as its glaze to add a little extra wettness to the black and was topped off with Dodo Supernatural which enhanced the depth of gloss very slightly indeed.
Get it like a deep, glossy pool of water on the paint would be my aim - and the only way to do that is to burnish the finish with a fine finishing polish.