Can I use tile adhesive to fix these tiles to plaster. Does new
plaster have to be primed for this. A section of the ceiling fell down
at the weekend and I had to repatch. Not a nice job as all sorts of
sh** comes down from the ceiling.

I have bought some new tiles and it does say attache with wallpaper
adhesive, but having taken some down a while ago, it seemed like blobs
of tile adhesive. Or was it something else?

Many thanks guys for any comments.