These pots cost 77 cents each at Home Depot and the Creatix airbrush paint (the opaque, not the transparent variety) runs about $4.50 per bottle. Using miniscule amounts of paint you can cover a lot of area with dip pen and brush. Try to keep the paint thin, as opposed to mounding it. Then use the microwave like a kiln. After a couple minutes, your pots should be waterproof. I've never tried the airbrush--maybe that would work, too.