Primers and tanking.

[ray99]

Ok so I am thick but am I right in saying that you use the primer all over the wall and then the tanking on top of that on those parts of the wall that will get wet.

£45 from Screwfix for 3Kg tanking is all I can find. Just doing top and side of the bath so seems expensive for my needs but if it has to be done then thats it.

 

[Richard C]

You only ever use primer if the manufacturer of whatever you using recommends it & that will depend on the tile base & what ever you putting over it. Is the Screwfix stuff your using Dunlop liquid tanking membrane? What are the walls made of in your “wet area”.

 

[ray99]

Wall looks to be normal plasterboard with a plaster skim except where the old tile adhesive has pulled it off.
Using Mapei fast set adhesive which says plaster backgrounds must be primed with Mapei Plaster Primer. I have Mapei Primer G for use on porous, non porous and gypsum based substrates and will be getting a Dunlop waterproofing shower kit from Screwfix (bottom right on page 86 of current catalogue)