just fixed one on a wg4 use seal all 3 tubes around upper and lower rim clean as good as you can fist then use red coat tank sealer on inside on tank let dry for a week bullet proof fix good luck

I know super glue is impervious to gasoline and is useful for coating sinking cork carburetor floats.

I wonder if it would be a good quick fix for the leaky two part cast aluminum gas tanks? Perhaps one would squirt a tube in and roll the tank so the seams get coated before it dries.

(Just me thinking out loud.)

I acquired a couple cast aluminum tank/rewind assemblies at a meet Saturday. Tonignt I cleaned
them up. Seam leaked badly on one so I removed all
the threaded rods and the two hex socket screws
and split the tank open. It appears that some sort
of gasket and sealer such as Permatex were used.
originally. I think that 1940 was way too early
for epoxy or other modern seal agent.
It appears that fasteners on the threaded rods
"pull" the tank halves together and clamp the
gasket/sealer between. It would appear that removing
the fasteners releases the claming force and may
lead to leakage. Anyway I needed the rewinds so
things will work out even if I can not fix this
tank. Will try repairing and report results either
way.
Louis

According to some literature I read somewhere, the two halves of the cast tanks were assembled with the gasket and baked at the factory to seal them .

Such use of oven will get veto from wife.
Will see what NAPA has to offer.
Louis