>>7198737They look like this. You shouldn't need a dedicated art supply store, Walgreenses and Walmarts have them if you're in the US.
All the rubbing will change the surface of the torso a little, smoothing out the slight pebbled texture. IMO it's good enough, impossible to notice unless specifically looking for it. There's probably a better way.
I can't remember what
>>7198685 used.