There’s a crack on top of my RV’s gray water tank. How do I fix it? —Buck, 2021 Puma Palomino
There are several products you can use to fix a crack on your RV’s gray water tank. Most tanks are made of polyethylene material and start off as small beads placed in a mold and heated while the mold spins in all directions. This melts the plastic and coats the inside of the mold, creating a seamless tank. This plastic is softer and more flexible than ABS plastic, which is used for shower stalls.
I would start by drilling a hole at each end of the crack on the gray water tank to keep it from going further. Then I’d clean the surface with rubbing alcohol.
Products to fix a crack on a gray water tank
There are several epoxies that mix two components and are applied to the crack. Or, another option is J-B Weld, which has a putty that claims to have a 600 psi strength, but I have not used it.
Another option that I have used is a plastic weld kit that melts plastic material that comes in sticks or rods and can be reinforced with a mesh patch if needed.
We’ve used this method before and it worked great. The kit we used had a small butane torch and a spin weld fitting that we needed to add a little more material.
Then there are always the “As Seen On TV” products. The one that stands out to me is Flex Tape. The commercial shows the salesmen slapping on some tape to the side of a plastic tank that is gushing out water, and later on a screen door on the bottom of a boat! I have not used it on tanks but have used it on the roof of RVs and trailers and it lasted for more than two years.
All of these products can be purchased on Amazon and are a relatively inexpensive fix for a crack in a gray water tank. The best one for your application depends on the accessibility to the crack, how large it is, and the level of work you are willing to do.
Dave Solberg is a leading expert in the RV industry and the author of the “RV Handbook.”
Read more from Dave here.
HAVE A QUESTION FOR DAVE?
We have started a new forum link for Ask Dave. Please be as brief as possible. Attach a photo or two if it might help Dave with his response. Click to visit Dave’s forum. Or send your inquiries to him using the form below.