Best adhesive for window blanks?

[solardude]

One thing to note about Panel Bonder (3M 8115) is that it is made to be applied to painted/primed surfaces. When I use it on bare metal I always take an angle grinder and buzz the area that I plan to apply the adhesive to. I do this to ensure I'm not applying it to an oxidized surface. Depending on the situation, I will apply Pinch Weld Primer for critical applications.

SolarDude

[Darkspeed]

Scuffed , alcohol wipe, thick bead of 3M 8115, and held the steel blank from the inside of the bus with six 100lb pull magnets and it set up real nice!
Seven more to go...