I have searched the forum and i think i might have google blindness 
I thought I read somewhere that you use Sonax bsd as a sealer then wax over it, so i went and bought a bottle!
and now i cant for the life of me find anywhere that says so, in fact i found some that say the opposite!
I have a pearl black MK7 GTD and wanted something that would help hide any marks etc and then i was going to use the dodo juice on top to increase the depth and shine.
Any help would be appreciated
Thanks
You can do anything you want, there are no hard and fast rules.
However using wax on top of a polymer based sealant (Sonax BSD) or nano based sealant (Gtechniq C2v3) may reduce the longevity and performance of the wax. Wax is organic based and does not bond properly with polymer and nano sealants so I can't see it lasting too long on top of the BSD. But there's only one way to find out, and as you've bought it you might as well try. Of course you can also try it over wax, but again might not bond too well.
If you prefer the finish of a wax and have some swirls and marks to hide, then you can't do much better than apply one or two coats of Poorboys Black Hole glaze, under your DoDo wax.
http://www.cleanyourcar.co.uk/glazes/poorboys-black-hole/prod_494.htmlIt's brilliant stuff, which contains fillers that mask and hide light swirls and scratches, and it really does work. Gives great shine too. Then top it off with your wax, to get that extra depth that Deep Black Pearl really benefits from, and that DoDo Juice wax is so good at.