Just wanted to follow up.
I installed the roof and drip rails with the SEM Panel Adhesive. It worked great and is super strong. I did spot welds every few inches or so as well, and clamped in a 60 degree+ garage overnight. Once it set, I removed the clamps and there was no rebound, so I believe a 100% adhesion was made.
The BEST way to adhere this is to use a 36 grit roloc at a very low speed to maintain the grind marks (creates a better mechanical bond) on both pieces, and keep the adhesive away from the weld areas or it wont weld very well. This will also speed up the curing process due to heat, so keep that in mind.
