Cracked 96 wagon fuel tank

Hey guys,
The tank in the wife's wagon started to leak in October. Took me a while to find it but I found a crack on the top passenger side where it contacts the underside of the floor panel. I got a fast weld repair kit for plastic tanks from Oreillys. It worked for a while but is leaking again. I didn't expect it to last due to the repair epoxy dried hard and the tank flexes being plastic.
Any ideas how I can fix this crack or better yet, any one in the Atlanta area with a spare 94-96 wagon fuel tank?
Currently scouring junk yards.
Thanks,
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Bud