Old plaster came away, render looks solid and flat what do i need to seal it with prior to tiling?

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Ok ive made the decision to remove all the bonding or first skim (whatever its best know as) and go back to the brickwork. Ive done a fair bit of plasterboarding but never aquaboarding and to me this looks an expensive option and could be tricky to do around the window area so thinking it might be cheaper to plasterboard and then tank the area around bath/shower.
 
Ive never tanked an area before.does it consist of taping the plasterboard joints and then painting the area with a waterproof sealer?
 
Ive never tanked an area before.does it consist of taping the plasterboard joints and then painting the area with a waterproof sealer?

Pretty much yes. A good kit for DIY use is Mapei Mapegum WPS which is widely available all over the place. Good demo videos on YouTube
 

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