Thanks gents (@johnb) & (@fiveten)
I made some paint progress, timing is tight as my son decided he wanted to go ahead with a kitchen renovation.
After applying the first round of colours, I almost gave up on the Tri-Colour scheme as it looked quick messy.
The AK-2268 'Tea Colour' seemed a bit light so I swapped to Tamiya XF-64 Red Brown to achieve a slightly darker shade.
The slightly thinned AK paints do spray well and give decent coverage, but they seem to dry up my airbrush tip very quickly and it was very tricky to get a consistent stream of paint and hard to avoid blobbing.
When I switched to the slightly thinned XF-64 I noticed a big difference - continuous paint stream and very slow cup drying yet very quick to dry once on the model.
I can't imagine using oil enamel paints as it would be very smelly and very messy cleanup and it would take overnight to dry.
Here is a result after a second round of paints, switching in between colors as required for each section and using cut paper edges to get a steady line and a slight fading of colours.
There seems to be no consistency with the order of colour application, lucky the AK-267 Dry Grass can cover the darker colours.
2 attached images. Click to enlarge.
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1. Quick flush and clean-up in between Acrylic paint colours
2. Using New Fume hood Fan with Fine Furnace Filter in place as paint bench filter - WORKS GREAT!
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1. First round of painting, constant tip clogs made it difficult to get a consistent edge - 2nd round required
2. Second round of Paint and tighter paint lines achieved.
Light color painted last - great coverage over darker colours.