Quoted from Pimp77:
I’m curious if this a widespread practice and if I should be doing this...when your balls get scratched up do you just re-tumble them? I assume unless there’s a big nick or deep scratch you can keep tumbling them?
That’s right. Usually try to do them as soon as they start to lose their mirror like sheen. Eventually you’ll get balls that come out of the tumbler with shiny flat facets all over them, then it’s time to recycle them.