What tools does he use?

Anyone who knows what tools he uses when making his beautiful art?
http://www.google.se/images?q=Larry%20MacDougall&oe=utf-8&rls=org.mozilla:sv-SE:official&client=firefox-a&um=1&hl=sv&ie=UTF-8&source=og&sa=N&tab=wi

They look like acrylics or watercolors with some ink, maybe gouache overpainting too.