I use a combination of Model Masters Acryl and Appel Barrel for both vehicles and figures. Spray paint works great for vehicles as well, but you may need to sand them or use a primer depending on the surface.

Also if you're repainting newer figures it's important to wash them thoroughly with warm water and dish soap (anything with citric acid in it). This will get rid of the mold release agent that can keep paint from adhering well to plastics.

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