HI everybody, hope you are all safe. I'm retired now (not a tradesman) but I help a guy out who refurbishes bathrooms and other things. He's actually an electrician but is a self taught plumber and a very clever guy. I get to do a bit of tiling and we have a lot of banter about applying the adhesive. He always back butters the tile which I think is very labour intensive but no matter what I do I cannot successfully apply the adhesive to the wall (mainly plasterboard), it just falls off and he has a laugh at my expense. I've watched numerous videos where experienced tilers apply the adhesive to the wall with no problem. Any advice would be appreciated.