How should I fix this?

Was it glued on at the factory somehow? Do I need JB Weld or MarineTex?

Should it be welded?

This is a Canadian Spectra tank, not an original tank.
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IMG_20231230_183719.jpg (50.99 KB, 140 downloads)
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IMG_20231230_183814.jpg (44.02 KB, 140 downloads)
IMG_20231230_183836.jpg (43.24 KB, 140 downloads)
IMG_20231230_183843.jpg (36.22 KB, 139 downloads)
IMG_20231230_183849.jpg (41.21 KB, 139 downloads)

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)