Create a polished surface on 3D printed parts (Amazing)

I boiling acetone in a glass. Acetone boil at 56°C (132.8°F ). Then I insert a 3D printed part of the glass. After about a minute the surface begins to melt and become shiny. Remove parts to let them dry. Do not touch the surface it can get fingerprints. Aseton is flammable so be careful. Use ventilation.