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I am wondering if anybody has painted their models white, full primed. And then using water colour to paint it? Would it give it a cool water colour impresionist look or would it not dry properly on the pastic model? I know when you paint water colour you wet the paper so that it soaks in. I was wondering of using retarder with very very little paint could work.

I am trying to picture things that could work. I am thinking something brown. Perhaps tyranid or a white dark angel first company terminator with some reds on it?

I think it would muddy quickly and end up looking like bad washes. I'm in college doing watercolor, and it's tough stuff to play with.

Could work for certain effects. Will want intercoat clear putting down each time you're done working with a colour and would like the next one to not blend with the previous layer. If you want to do a lot of layers you may run into problems with thickness of so many coats of varnish between layers.
But used right it could work
Gesso primer might be nicer as its incredibly toothy and absorbant for holding water colour in place.