Plumbata
Posts: 1535
Joined: 12/4/2007 Status: offline
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For ancient tar, I have used Carbo-Sol (Trichloroethylene) with great success. I had a small glue cauldron with a wrought handle that had lots of tar, as well as an ancient end of a broken paintbrush stuck in the bottom. I heated it to melt what I could, scraped that out, then swirled some carbosol in there and the transformation was amazing. Within seconds the tar was gone, including the hardened 100 year old tar near the top edge of the cauldron, leaving a clean metal surface behind. No scrubbing necessary; mere contact was enough to dissolve it almost instantly. Carbo-Sol may be hard to find now due to environmental restrictions, but if you can obtain it it would be the best. No solvent I have used before works through hydrocarbons with such speed and efficacy. 2nd suggestion would be Acetone, Gasoline, or other volitile mineral spirits.
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