When I replaced the full quarter on my 69 convertible I used Duramix. I did a lot of research and felt it was a great product. I still did some spot welding and skip welding but the better part of the panel was glued. I did this work about three years ago and still no problem.

Check their web sit they might have what you are looking for.

3m.com/us/auto_marine_aero/aad/prod_lines/duramix/duramix.jhtml