3m super 77 will hold for a short while and then fail. Its primary use is for crafts, not upholstery. It is also not satisfactory for gluing in foam insulation--been there, done that. Hope this helps. Jack
After all my pondering and attempts to figure out the seat upholstery, I opted for slip covers. I made these slide over the back and bottom like pillow cases, with the excess tucked in the fold.
Just a quick update, as we get this bus back together. Take a look at our Before and Now! With the kids' seats in place, and the futons/beds in, we have managed to keep the windows unobstructed and still have room for 6 to sleep. Yessss! Next step is to figure out the electrical and the teeny tiny kitchen unit. It turns out we have more room left for that than we imagined...