Thanks heaps, Barb, Rod and Brenda.
I usually paint the colours by hand, however, I decided to give my airbrush a shot this time, but it was not as successful as I had hoped. I did the red and some black with it.
I reverted to the good old brush. I use normal household water based acrylics in either a flat or satin, then cover with clear gloss lacquer, cutting back with 320g paper between coats. The same is done with the most colour, 2 coats and cut back between. I have 90% of my colours in 1 litre, some in 4 litre tins as I used to make hundreds of toys. Now I find that if I want a new colour I will get a sample pot.