Are you good with a Dremel?

[BushMasterBoy]

I asked AI on Google and it said this...

"To smooth plastic, wet-sand with progressively finer grits of sandpaper (e.g., starting around 220 or 320 grit and moving to 400, 600, 800, and finer) to remove imperfections, then polish with a liquid polishing compound using a buffer or cloth for a final shine. Start with coarser grits for rougher surfaces and use water to keep the sandpaper from clogging."


Sorry, the search term was "smoothing plastic out"

You may want to do your own search if the material is not plastic