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Old 03-31-2014, 09:20 PM   #1
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1971 27' Overlander
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Repairing black water tank?

Hey All,

Just curious if any of you have had any luck repairing cracks (or not) in the black water tank? Here's a pic of mine. Just wondering if an epoxy will work on this?

THanks!
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Old 04-01-2014, 10:13 AM   #2
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The tank looks unreparable. The crack goes around the curve of the tank. I have had trouble with epoxy bonding on some types of plastic. 40 or so gallons of waste in the tank generates some pressure at the bottom.
You don't want a failure with a black water tank that would be an unpleasant mess to clean up.
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Old 04-01-2014, 10:34 AM   #3
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That tank is likely made of roto-molded poly-ethylene, and as such, there aren't many glues that will stick to it. Probably your only chance of repair would be to find someone with plastic welding capabilities to weld up the cracks, and then weld a patch over the cracks for added strength. I've tried a little plastic welding, and it is more art than science.

good luck!
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Old 04-01-2014, 10:36 AM   #4
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STLRooster,
I'm pretty sure they were using high density polypropylene tanks for everything back then. Almost impossible to use any kind of adhesive. If that is the top of he tank I might risk having it welded by a professional, if it is on the bottom, I'd just replace it. They aren't that expensive.
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Old 04-01-2014, 10:43 AM   #5
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Quote:
Originally Posted by STLRooster View Post
Hey All,

Just curious if any of you have had any luck repairing cracks (or not) in the black water tank? Here's a pic of mine. Just wondering if an epoxy will work on this?

THanks!
Plastics then were very different from today.

A fix, especially with epoxy, would be very temporary, at best.

A fiberglass replacement is available.

Andy
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Old 04-01-2014, 11:34 AM   #6
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Thanks for the replies everyone. Just thought I would give it a shot. Looks like a shiny (not for long) new one is on the way!

And...to answer the question, it is on the bottom of the tank.

Greg
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