Help with needle size
 

Hi,

I'm looking to start painting some shells mostly 1/10 & 1/8 scales sizes but I can decide on what needle size to get for the air brush. I'll be using water based paints like fastkolor or Vallejo premium rc but not sure on 0.2 or 0.4? Any suggestion from more experienced folk would be great, I don't want to have to buy twice really.

Thanks

Kev.