When I used to build bathrooms for a living I had a particular job where the customers wanted to save money on the shower, so they have me put in plastic shower walls that were to be glued to the sheetrock.
I don't know why, to this day, but nothing wanted to stick, and the stuff that would have stuck would have melted the plastic............
It sounds like you might have to use the flammable stuff, the Lexel clear caulking, that can even be put on to wet surfaces.
I think this would be the way to go as long as you don't run a ventilation fan that has a sparking motor or light any cigarettes while it's curing.
Unlike silicone, this stuff can be applied over itself in the case of repairs, etc.
Most good hardware stores carry it.
Best of luck.