cleaning/tumbling

[reid ryder]

Good morning, thanks to all of the info I've gotten on this site I'm almost ready to start tumbling. Wondering what grit of aluminum oxide is best/safest to use for tumbling bottles and insulators. Thanks in advance, Reid.

 

[GuntherHess]

I beleive aluminum oxide is normally used as a polish.
here is some info on the different cleaning compounds...
http://www.jardoctor.com/CleaningOxides.htm

insulators probably vary in hardness depending on when they were made and what glass was used.