Interesting you should bring up plumbers epoxy. I grew up in Nevada and (misspent) most of my life as a avid off road driver/explorer. The old Desert Rats that we learned from always had a "Hell Box" in it was all kinds of useful stuff . Plumbers Epoxy was something everyone carried. Who knows it worked on the old Jeeps.

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces