Old thread but seems the right place to ask. On Richie's recommendation I bought a Veda WD-186R airbrush kit, and have been learning how to use it, and as a total novice very happy with it so far. Question: which needle size should I use for weathering, and which for spraying a coach? It came with 0.2, 0.3 and 0.5mm needles and nozzle pair. so far I have only used the 0.2mm.

Thanks in anticipation
Noel