Jean,
I do several thinner layers, usually one horizontal and one vertical. Do not put too much on your brush and DRAG it across the panel. You can try using an acrylic dryer retardant in it so you have more time to work the surface.
A thin, wide brush is better than a thick one, 3-4 inches.
My husband had a spray room built for me out of desperation. He was tired of green or whatever dust covering everthing.
Make sure you get a big airbrush, not the regular small ones.
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