What's a good sealer to put in a leaky gas tank, leaking at a seam.

 

...need to get tank repaired or replaced. If this is on your 06 it may be under warranty. Tank sealers, Kream, POR 15 and Redcote are intended to seal inside of tank as protection against rust/corrosion, not seal leaks.Wouldn't want to do a "Billy Lane" alongside the road somewhere.
Later

 

Get a new tank, probably under warranty if its for the 06.

 

Oops, its not for my 06. It's for a tank I welded together. For a bike my son built. He used J B Weld and we think it sealed it, but I was wondering if anyone had any experience with sealing a leaky gas tank.

 

I had a tank for my Sportster that kept leaking. I coated it with Kream but it leaked. I used JB Weld on the outside, but it still leaked around the mount. So I then put some gas epoxy gluethat I found at Advance Auto in and around the cracks that I couldn't get the JB to work on. It doesn't show with the tank on the bike, but it works fine now and I put enough on so that it won't crack from the vibration. I'm looking at another tank now and I think I'll use POR 15 on it. I've liked their products from using them on my car. I thought that the Kream was too thin and it took several coats to work. You pour it in and tip the tank to let it coat the sides and then drain it out to let it dry. Then start the process over again the next day. (It did plug my vent tube!!!) I should have kept coating the tank until I used all the product, but I wanted to ride it and thought I had fixed it. It's a messy process. I think that because the mount is on the hump that it's in a place that the coating ran off and didn't get thick enough on. The JB probably would have worked it I could have gotten it completely around the mount. But in the end the thinner epoxy I dripped on and let run down and in the seams of the bracket stopped my leak.
Good Luck!

 

I used the sealer stuff years ago on a tank that had elctrolysis porosity in it.
First flushed the tank with MEK or ACETONE. Then flushed again with a pre-paint
metal prep (acid etches the tank).
Then poured the sealer in. Coated the entire inside of tank, not just the seam.
I got rid of the trck last month. After 20 years it never did leak and never changed the fuel
filter any more than for usual maintenance.