[jfoutz]

you can also dip stuff in acetone to smooth it and perhaps enamel it to really seal it up. I imagine there's a bunch of stuff you could do to improve the odds.

However, treating a 3d printed spoon like any old metal spoon adds risk.

[if_by_whisky]

Acetone baths don't really work with PLA. Though I've seen it get beautiful results with ABS.