,,,masking job with clear flat lacquer. Then light grey, then white. Worked OK. Still am wondering what I need to do to get better demarcations other than creating 1/350th people to do my painting for me.

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Hi Simon, I suggest an undercoat of the Mr. Surfacer Base White.
I've had good results with it, thined 50 -50 & sprayed on.
HTH, David