Sealing a deuce fuel tank

I need to seal the tank in my deuce. Any one have any recommendations on what brand of sealer to use? (had the tank boiled out recently and am now leaking from seam)

Joel, my fuel tank was in pretty bad shape when I got it, many leaks especially where the support bands were. I cleaned the surface down to bare metal with a grinder/sander and applied fiberglass to seal it. Has been a year now and it appears to be good and tight.
Used fiberglass to seal off one of the inside baffels too for the two-tank system.

Joel,
I have used "seal-all" for years. Wal-mart generally sells it(in auto sec.). Comes in a red, black, yellow tube. A couple ounces. Costs a buck something. Clean the surface real good and put it on. Unbelievable stuff, especially when you look at the price of it. I did a tank on an M135...around the straps and some pit holes near the drain plug....I'd say 10-11 years ago. Still not leaking. Be aware that the stuff really does not want to come off your fingers. No cleaner, solvent whatever I have found will get it off. Let it dry a little and then just work it off by rubbing your fingers together.

It's clean already. You can braze or solder it.

I have used this stuff before:

http://www.hirschauto.com/acb/showdetl.cfm?&DID=27&Product_ID=6&CATID=3

Works great. one can does a thirty gallon tank and it works with all fuel types.

As far as availability...My local NAPA has it, but they cater to my hometown antique car club. So they may be the only one...Looks like mail order otherwise.

Do you really need to seal a diesel fuel tank? I know gas will absorb moisture from the atmosphere, but isn't diesel "oily" enough to protect the interior from rust? The possibly NOS tank I picked up a bit ago had bare steel interior.

Joel wants to seal it because of a seam leak after having it boiled. I would think diesel, being a thin oil, would prevent rust but its just not so. They can become a nasty mess inside. I've tossed a few for just that reason and so have many of the members. Who'da thunk!

The tank I used (still use) for the dual tank project was rusty inside with the plating gone in many places, not to mention the pin holes repaired with fiberglass.
The specs of rust has caused a bunch of filter and valve problems over the last year with thousands of miles logged.
I now have another tank to worry about, the one for the 8x8. It's not the original aluminum tank, but a smaller used tank from a 5-ton M52. This time I'm determined to do the tank right, maybe one day I'll find the right tank for it, but meanwhile...