what sealant to use?

[GTS225]

'99 Jayco, 24BH. Have a small drip leak at the black tank hub, right where it connects to the flush piping. Not inclined to rip into it right now, as I have a trip planned in a week-and-a-half. Appears to have had something put on it in the pase.
What might you folks recommend to coat the outside of the connection to stop the leak, even if only temporary?

Thanks.....Roger

[PapaU]

I have the same issue with my 2016 285RSTS. Judging by the insulation (after cutting the plastic under frame cover), it looks like it's been seeping since day one. I was hoping to find a few suggestions also. I'm leaning toward JB Weld Plastic Bonder around the whole joint. Flex Seal tape to seal the plastic under cover.

[JFlightRisk]

I keep a tube of this around. Pretty impressive stuff for emergency repairs.

https://www.amazon.com/Seal-All-3801.../dp/B008VK0JS4

[Marcm157]

You can try some of the Flex Seal products. I used the brush on stuff on crack in a drain line n my house as a "temporary" fix and that was almost 18 months ago. I still intend to fix it correctly someday...

[GTS225]

Well, I had some Flexseal tape around, so it went on, and did well for the week in Michigan. However, there's no trip planned in the short term, so I'll look at a more permanent solution.
I'm kind of liking that "Seal-all" product that JFlight linked. It's an MEK and Acetone product, which should chemically weld the plastics together nicely.
(Once I get the previously-applied gunk off the connection. )

Roger

[PapaU]

So much for the JB Weld. I let it cure for two days then filled the tank. It didn't drip at all. Drained the tank. Went out today to add the Flex Seal tape - the glue was soft and leaking (what little water was in the joint). Propped a piece of wood to flex the joint and let it drain completely. I'll get some Seal All on order and stop at my RV dealer tomorrow, see what they recommend (other than "Bring it in").
I'll keep ya posted. Gotta get it fixed - trip to KC in Sept.

[PapaU]

Glues did not work on the crack. After cleaning of all remnants of JB Weld, I tried Flex Seal tape. One strip cut to fit around the curve of the drain pipe and another over the top wrapped onto the drain pipe. It held up for the trip to KC and approx. 300 miles on the road while 2/3 full. If this ever fails, I do have a relative that works for a company that welds plastic - much cheaper than replacing the tank.
It's not pretty, but it's sealed.

[ARoamer]

I have always had good results with JB weld, but the area must be clean, dry, and roughed up with sandpaper first. Did my aluminum Aux diesel fuel tank that had a cracked weld 6" long, it's still holding fine after 6 months. Fingers crossed!

[Jerry713]

Originally Posted by ARoamer

I have always had good results with JB weld, but the area must be clean, dry, and roughed up with sandpaper first. Did my aluminum Aux diesel fuel tank that had a cracked weld 6" long, it's still holding fine after 6 months. Fingers crossed!

I once put original JB Weld on a radiator end cap leak. I drove the truck for almost 2 years and it was still holding when I got rid of the truck.

One key I found at least with the original is it pays to open up the crack some. I used a hacksaw blade. I think it helps a lot to have some JB Weld down in the crack.

[Happy wife / happy life]

Originally Posted by PapaU

It's not pretty, but it's sealed.

Beauty is in the eye of the beholder. If it doesn’t leak it’s beautiful!!

[TWP723]

T-88 System Three