I had the same issue,I was able to purchase the adhesive from International Bus.
Originally Posted by
Roadrunner
Richard,
It seems that the frame of this small panel (about 10"-12") was rivited from the back, but the skin was bonded to the frame with the black substance. I see some of the really small (2"-3") panels have rivets in the sides of the panels, but this one doesn't seem to. It appears that the full size panels may also be attached to their frame with a mastic of some kind, then the frame is riveted to the side of the coach.
Granvil Tracy
2000 Vantare XLV45, S-2