How to make 3D printed models glossy and how to paint them?

acetone baths only work on abs. pla is easier to print but needs love afterwards. sanding, filler and primer filler (4$ at walmart) i prefer airbrush pver hand painting. good luck

In order to turn the 3D printed objects glossy, you can rub them with the help of a sandpaper, use finishing putty to coat the surface and then paint it with a suitable enamel paint.
This would offer your objects the desired gloss.

for the glossy effect, it is necessary to place the object in a bath of acetone vapor (without touching the acetone of course). A simple jar is enough, and heating acetone. (I have some examples in my portfolio :
https://www.cgtrader.com/3d-models/animals/mammal/cartoon-bull-rigged

Any paint for a scale model can be used to paint a printed object.