Why not contact a body shop supply house and get some structural adhesive. I know that there are different cure times as well as different strengths. I would talk to a salesman that should know the differences, and could recommend the correct product for that use. One thing I am sure of, the stuff now will be a whole lot better than what Jaguar used. I think that the "glue" might be a great way to install repair panels on cars. No welding, and should be easier to completely rustproof the repair. Good Luck
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Jesse Bogan
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'93 XJ6
'89 XJS coupe V12
'87 Audi Turbo Quattro Wagon
'67 Chevy Corvair coupe
Uh ohh 64 Chrysler newport hardtop wagon