I might be wrong but I think he might be thinking of the surface mount trunking stuff, that is self adhesive. I have never seen the tube type conduit (that I assume you are talking about) with any kind of adhesive on it.
For using the hot glue, don't stick it on the tube and then push in, you get a gap at the back then and if it lifts away the glue is all dusty and won't stick again, instead push the conduit into place and then squirt glue down the edges. Two man job for easiest results.
I recently had my house rewired using plastic tubular conduit chased into the walls and it was held in place with an occasional dab of render or tile adhesive (I'm not sure). Once the wiring was done it was filled in with the same stuff and then skimmed.