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Hey folks painting up grey and purple tau.

What should I undercoat and base coat?

Looking at Iron Hull grey from P3. And beaton purple.

Can you paint purple over grey or black?

Should I undercoat white black or grey.. Or undercoat black and base coat grey? Then paint purple. Or is a white under coat better.

Well, if you're using both colours on a model I'd suggest using a grey primer/base coat and finding a decent purple to paint over it (grey would work fine). It depends entirely on the purple you're using.

While I love my Army Painter purple spray - the dropped bottle paint is watery and useless, where my Game Colour from Vallejo has excellent coverage for hand painting. Just depends on the colours you end up with.