If using Enamel, clean quick with thinner.
Just dip in for a second, take brush out and wipe on paper towel should come right off.
If using Acrylic, clean quick with running water.
Wipe clean with paper towel
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When painting plastic. If you want to keep the factory color. I suggest "Clear Matte" spray, its in a can. You could get this at any Hardware or Art Store. I get mine from Michaels.
Just spray on, till dry. Your colors will go right on. Make sure you shake your paints well before you use. I think you might be using Enamels and not shaking before you use because the enamel oil (thinner type) separates from the paint and they need to be mixed together.
If you want to change the factory color use a flat primer color for your base color. Use whites for blues or yellows, greys for darker colors and black for silvers and greys.
Just my 2-cents have proven well for me, ive done this for years and just got back into it...
