3M 8115 ....aka "panel bond"
People like to say its the same as JB weld but there is a reason JB weld is a few bucks and panel bond is a lot more. But its well worth it because they bond quarter panels to cars with the stuff and its automotive grade and can withstand any temp and its some all around wonder stuff. Its used in new cars........not anything like the JB weld at walmart that is made to put ralphie's dad's leg lamp back together. :???:
I even build models with 8115 and you would have to cut them apart.
8115 can be used to rebuild plastic grilles. when used to bond two pieces of metal together it has a higher tensile strength than if the two pieces of metal were welded.
its the stuff or professionals.