There was some discussion about this some time back:
https://community.ceramicartsdaily.org/topic/24085-question-about-pug-mills-and-corrosion-bacho/I have an older Bluebird 440 with pitted barrel. Bought it used from
potter who used porcelain and B-Mix type clays. Apparently this potter
didn't clean out the machine on a regular basis. I now use this pug
mill with pitted barrel to reclaim brown & red stoneware. It is
difficult to seal the barrel to keep clay moist in the barrel for
extended periods of time, so I just let the clay left in the barrel
dry a bit, undo 4 bolts and pull the barrel off to clean out dried
clay.
William Schran...@twc.com703-505-1617
-----------------------------------------From: "ronroy--- via
Clayart"
To: "Clayart international pottery discussion forum"
Cc: ron...@ca.inter.net
Sent: Sunday September 14 2025 4:33:03PM
Subject: [Clayart] pitting in blue bird pug mill barrel.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clayartforum.com/pipermail/clayart/attachments/20250914/9f371b33/attachment.htm>