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Old 10-14-2018, 04:59 PM   #1
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Black tar substance

Can anyone tell me what the black tar substance used on the front and rear joins is?


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Old 10-14-2018, 04:59 PM   #2
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Pics please.

Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
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Old 10-14-2018, 06:42 PM   #3
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It might also help to know the RV model and if it's aluminum or fiberglas sided.
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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Old 10-14-2018, 07:05 PM   #4
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What’s a rear joins ?
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Old 12-06-2018, 07:58 PM   #5
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I think what you are talking about is called butyl rubber.
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