Originally Posted by Crisfole
Ok, I'll describe... Weird that the links work for me. Anyway:
The entire inter wall is covered in old adhesive and composite strips of wood used to keep buzzing down, I presume. It's all 35+ years old and very hard to get off...
If its dry and not sticky or oily it should stick ok. You could get a cheap can of great stuff and do a test area. With a bus of that age you want to make sure the metal is not corroding behind the adhesive. I had lots of sticky black goo that I wasn't confident spray foam would stick to so I've removed it. It was a huge PITA but I know my spray foam will stick now.