3m panel adhesive is the only thing I could recommend... it is designed specifically for what you are doing, it is used to bond new cars together as well as for the bodywork industry to do repairs.

http://3mcollision.com/3m-panel-bonding-adhesive-08115.html

Last edited by Draggin; 28/03/16 02:44 PM.
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2016 M3W John A Prestwich Special
1952 Ford 8N
1968 Honda CL175,and 2018 Ural Retro