Spray anything you want, anywhere you want, and you don't need spray equipment. The Preval Power Unit is a self-contained, completely portable, disposable unit. Simply pour dye or thinned Cova Color into the glass jar (sold separately #2092-00) and spray away. The Preval Power Unit will spray up to 16 fl. oz. of liquid. Clean after each use and reuse again another day. A must for all workshops.