I have used the metallic Jazz paints. They are fantastic!!!!
I purchased them through the Sax Arts and Crafts catalog. Yes, you can
buy them in larger quantities. I did so when my students painted
Egyptian artifacts on clay, recreated paper walls of hieroglyphs,
their faces (yes with soap added), made sarcophaguses,(sarcophagi)? and
other nonporous materials.
(The paint will water down well also!)
I am not sure about pumps.. call Sax for more info..
Lauren H. Killam