Is there some kind of glue that can bond copper to fiberglass and
withstand the heat of a soldering iron? I have to glue some copper
strips to a board and can't just draw new traces with a silver ink pen
(really I can't, so don't suggest it or ask why). I've tried slow and
fast cure epoxies, super glue, and JB Weld, but all of them melt almost
instantly when I touch the soldering tip to them. The JB Weld lasts
slightly longer, so there must be some kind of epoxy that will work.

Exactly what glue (brand & part no. would be nice) do companies that do
fancy circuit board repairs use? I mean repairs like rebuilding areas
that have been chomped off completely.