I have had to re-plaster part of my shower room. This is about 25mm
thick and was done using browning and then finish plaster.
I am assuming that I need this to dry completey before I plaster. Once
this is done I should prime the surface.

I have read conflicting advice on this. The tiling faq

http://www.enigmatist.com/free/john49/tilefaq.htm
recommends the use of pva.

However, elsewhere I have read that this can cause problems if it gets
wet.

I would be interested to hear the views of the group on this.
Thanks
Tim