Master Airbrush Model G78 Single-Action Gravity Feed Air Abrasive Etching Air. This Professional Etching Airbrush Gun has a Large 1/2 oz. Cup and a 0.5 mm Needle/Nozzle Also includes: 6" Braided Hose with Mini-Inline Moisture Filter, Jar of Aluminum Oxide Abrasive 5 oz. (150g) net weight, Dust Mask and Hanger The Air Abrasive & Etching Airbrush Gun is a versatile instrument that can erase color errors and act as an etching tool. t is used by hobbyists and manufacturers to clean jewelry and fine parts, remove discoloration, rust, corrosion, etch glass, or cut monograms It is issued by lithographers to highlight half tones and erase defects without marring the surface or leaving a smudge.