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Neither of those two methods.
You lay down the base colours and allow them to dry, then you apply the 'marble' colours over the top and whilst they're still wet you move them around and leave impressions on them with plastic bags, clingfilm, PVC sheets, that sort of thing. To do a whole bike, you need a few sets of hands though!
It's a faff but it's worth the effort when it comes out well.
I'm really struck by it.
Marbling like a dip job? Or like when you Ice party rings.
I understand if it's patent protected tattoo invite only trade secret. I'm not gonna try it, just interesting int it