you can consider using shellac first instead of sitting there hoping, praying there will be no contamination. All you have to do is apply some thin coats of shellac, and it will seal anything underneath. After it dried, you can now use your water-based polyurethane right on top...
Improvements in Rotary Sprayer to apply Paint or similar Coatings, for exampleJAMES WILLIAM DAVISRICHARD WEINSTEINROBERT KENT CAMPBELL
Airless Sprayer Pump Power Source Electric Motor & Piston Pump Max.Working Pressure 22.7Mpa / 3300psi Max.Output 3.1 L/M Max.Tip Size 0.029 inch Dynamic Power 2200W Power Type 220V /110V 50HZ/60HZ Wearing Parts Plunger Rod, Gasket and Seal Kit ...
3.To achieve an orange peel texture, it must be done with a texture sprayer as it requires high air pressure and a small nozzle on the gun. The thin material and rapid spraying technique creates a lighter texture that most closely resembles an orange peel. In order to create a uniform te...