Andrew Gabriel wrote:
In article ,
Tim Decker writes:
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.

You have to check the instructions for the adhesive you use.
None are likely to recommend PVA as it's water soluable, which
is not a smart move in a shower.

That's why the tiles and the grout are there. To keep the plaster walls dry.

If ANY water gets to plaster you are in deep doggy-doos.Never mind the PVA.



You shouldn't need anything
on new plaster as the surface will be stable, and the adhesive
will contain its own bonding agent anyway. Just check it's
suitable for use on plaster (most are nowadays).

I would suggest using a waterproofer/plasticiser in the grout,
such as BAL Admix GT1, although this is more important on
untanked plasterboard walls.