The groove between the two wires didn't get shiny, but the rest is
very bright. This was after six hours of tumbling with Sunsheen
You need media that can burnish down in the groove. That's what
mixed shot is for, with its pins and little ball-cones (the ones that
look like Saturn). Sometimes you have to remove the pins from your
mixed shot because they can become lodged in artwork, and they aren't
always needed for good results, but sometimes they are necessary, and
sometimes you need something even smaller, like the teeny pins of a
The size and shape of media can be important. I just ran into this.
We had a closed form that had several large holes going through it,
and the closed form had some "squinched" areas. The potential for
small cones getting permanently stuck was obvious. Like most people,
we add new tumbling media to old as the volume decreases (the media
wears down and becomes smaller). Consequently, there are some fairly
small cones in our every-day mix (this is usually a good thing). We
used all new media for this project and had no trouble.