I own an MGB which has a dashboard painted in wrinkly black. I could take a photo of my dashboard, if you can't find one to examine. If that is like what you are looking for, try Moss:
https://www.moss-europe.co.uk/catalo...=crackle+paint
You might just notice that the Moss website calls it "crackle paint", despite the label on the can describing it as "wrinkle plus". Who is right?
Colin.