He uses the Z-Poxy PT-39 30 Minute epoxy to get much smoother surface finish. It is a dual component epoxy with the resin and hardener.
Here is how to video with the entire process and some tips:
I was not aware of this technique and it looks much easier then using acetone. I'm not sure what epoxies are available on my local market in Croatia but I will check it out.
|Smoothing Vader 3d printed mask with epoxy and a small paint brush|