Plaster board?

[Perry]

It was all paid for through Porcelanosa for Royalty!!!
I was on a price & I primed!!
I still don't know to be honest if you have to prime or not.
I've tiled thousands of meters of plasterboard & never had a failure but it still don't mean it's right!!

Most of the major adhesive companies say you don't have to but they do love selling more primer but as Diggy says he likes to as it doesn't skin as quick which would be one reason I would if that's what I wanted job to job as they say (hope it wasn't in a castle near me)

 

[area tiling]

Personally I don't prime plasterboard but can't see it doing any harm if you do!