Reddit reviews Alpha Abrasives Plastic Sanding Needles 320 Grit Fine Item 0403
We found 2 Reddit comments about Alpha Abrasives Plastic Sanding Needles 320 Grit Fine Item 0403. Here are the top ones, ranked by their Reddit score.
Get some plastic filler like this: https://smile.amazon.com/Vallejo-VJ70400-Plastic-Putty-17ml/dp/B000PHCNLC
I can recommend Tamiya, Vallejo and Mr. Surfacer. Check your local hobby store, they probably have these in stock if you don't want to wait for shipping. Model builders have been using fillers like this for ages and they work extremely well with plastics.
Technique wise, use the filler to close the gaps and lines then sand. Take your time with the sanding. You can wetsand if you want to (I personally prefer this). Once things are looking good, follow up with some some filler primer spray and then sand one more time with high grit/fine sand paper. For sanding, some sanding needles like this: https://www.amazon.com/Alpha-Abrasives-Plastic-Sanding-Needles/dp/B01LEC98AU help a TON for fine detail work.
You can also get some needle files, but I find these harder to use and less forgiving of mistakes when working with plastics.
PS: Checkout /r/modelmakers and http://cs.finescale.com/f/. You can learn a ton about techniques that can apply to finishing up 3D printed models.
Those files are extremely coarse. I'm not sure what you could use them for without showing obvious marks on the plastic.
I use these guys:
https://www.amazon.com/gp/product/B01LEC98AU/ref=oh_aui_search_detailpage?ie=UTF8&psc=1