Acetone only really works well on ABS.
There are some that claim it will work on PLA, but not nearly as well
there is a product out there meant for coating 3d printed projects - i forget the exact name of it tho.. never used it.
others have used automotive body filler to smooth things.. usually larger items like cosplay costumes & masks, but it could work for other things.
for some small objects, I have used a simple 2 part, 5 minute epoxy to smooth & give a "glassy" look.. like the eyes for the dragon model I am working on
SD4 #1 & #2 - Lawsy carriages, E3D v6, Rumba controller board, mirror bed plate, X motor fan, upgraded PSU & Mica bed heater
SD4 #3 - in the works ~ Folgertech FT-5, rev 1
Printit Industries Beta Tester - Horizon H1