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· Fixer of Broken junk
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Glycol based fluid such as Antifreeze tends to make rubber go a bit soft. I wouldn't use it in tubes.

I had a set of tubed tires on a garden tractor loaded with Antifreeze and they started leaking after a couple of years. Once I got them drained (which took a very long time to do without making a huge mess) I pulled the tubes out and both of them felt like a slimy wet noodle. The antifreeze must have been seeping through the thin rubber, I could not find any holes in the tubes but they were both very slimy and soft.

Alcohol based Windshield washer fluid isn't quite as heavy but it works good in tubes. Windshield washer fluid can be alot cheaper as well. Some of our local auto parts places have the -20F blue stuff on sale for around $2.50 a gallon from time to time.
 
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