Roo Grey Water tank outlet leak

[Sagecoachdriver]

A good friend has a Roo and has told me of his problem with dripping from the grey water tank where it exits the tank. He has tried various applications of which none have worked. The cost of a replacement tank isn't too much and he ordered a tank. He found out quickly that it is much more involved than first thought and he returned the tank. Dealer wants $600-$1,000 to replace it. It's a slow leak and I wondered if Eternabond tape might give him a semi mermanent fix. Below are photos.

[Sagecoachdriver]

I did an online search and found some RV Tank repair kits, do they work? Maybe roof asphalt patch?
Also, you can see the crack in the second photo towards the bottom of the tank in the white portion. What you are also seeing is his attempt to seal the leak with caulks and adhesive sealers.

[poorbuthappy]

plastic welding isn't that hard. just need to know what kind of plastic it is, to order the right filler rod. done a few kayaks and a peddle boat, not to hard and the kit was under $50....

[Mr Havercamp]

Despite what anyone says, getting any kind of sealant, caulk, epoxy, glue etc to stick to that tank is impossible. It will hold for awhile but eventually it will fail.

The tank is polyethylene, either medium or hard density. Most likely medium (MDPE)

The issue with heat welding is you will need to remove the plumbing which is ABS. You can't weld MDPE poly to ABS. It also appears that the crack is coming off the worst possible place, which is the fitting that the drain plumbing screws into. Thats a spin weld fitting. They spin it on with a router and a die which melts it to the tank. It would seem once you do all of that its just easier to change the tank. I would suggest he re order a tank. The new Roos use ABS tanks for black and gray as opposed to poly. The tank itself is typically held in with two bars, 4 bolts to frame. With an ABS tank you can glue fittings where you need them and don't need to spin weld which requires specific and expensive equipment. That my be why the dealer wanted so much to swap tanks.

[itat]

The first picture seems to show cracks radiating away from the outlet hole. That, and the crack you noted in the second picture, may indicate that the tank is not properly supported or at least it's sagging at the outlet and the ABS pipe is pulling away from the tank.

[Sagecoachdriver]

I told my friend about your posts and he hasn't gotten back to me with what he's going to do. I don't believe it's leaking real bad yet and he's looking for a quick an inexpensive temporary to permanent fix.