I am building some cupboards in our new bathroom. The walls are now made of soft wood-fibre insulation, so it is hard/impossible to screw any fixings to them (the fixings will just pull out). On the other hand, if I glue a sheet of wood to the wall, that will spread the load over a wide enough area that all should be well.
The walls are not completely flat, so any glue will need to be at least slightly gap-filling. I have had not had good experience with no-more-nails (skirting boards usually fall off). The obvious answer appears to be foaming polyurethane glue (manufacturers tend to claim that will fasten most things), but I have a pot of cascamite, and I wondered if that would work.
What does the panel think?