I've had a number of Sinn watches, and their dials are definitely a weak point when it comes to finishing. My current U1 has uneven paint on the hands that's pretty obvious without a loupe, if you're picky. Cases and bracelets are very good however, and they're built like tanks. Chances are you just got a bad one, but don't expect the same level of perfection that you'd get from a Rolex, Cartier, or an Omega. I'd send it back and ask for another. If you bought it from Watchbuys they're very good and should make it right.
'11 Ducati Multistrada 1200S Sport "Stormtrooper II"
'09 BMW HP2 Sport
'98 Ducati 900SS Final Edition "The old whore"
'93 Ducati 900SS "Slightly older whore"
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