In my ignorance I decided to make a mosaic for the garden using some PVC pipe, I learnt a lot along the way!
Both Liquid Nails and the powdered tile adhesive you mix with water seemed to stick the tiles but the ones which fell off later were those stuck with the mixed adhesive.
I’ll never use PVC pipe again because even now I can’t be sure the pieces won’t fall off. Someone did tell me attaching fly-wire to the pipe would have given the adhesive more holding power but they told me that after I’d finished.
The rocks are around the base to deter my dog from scratching her back on the pole, I’m sure it wouldn’t be long before she’d dislodge tiles.