Geo, the Aztek siphon feed has two bottle sizes and depending upon whose paint you use either the small or large cap fits perfectly onto the stock paint bottle. Small cap fits the 7.4 mL Testor's bottles perfectly. You do have to thin the stock paint, of course, so if I'm going to spray AND paint with a brush I'll buy two jars of the same color, thin one and mark with an AB. You still have the cap and siphon hose to clean but that does not amount to much waste.paint to use for small jobs without waste
You don't say what you are spraying, Acrylics, Enamel, or Lacquer. Acrylics are the easiest.cleaning fluid people use?