If this helps, I've been told before by a tiler friend that unless the sealant on a newly plastered wall is thin enough to soak in abit & dry with the plaster to form one solid backing, there is a chance that if the sealant is too thick & is tiled over there is a possibility that all can 'peel' off in time including the tiles I'm afraid .
you can now buy a specially formulated matt emulsion for new plaster which he waters down & adds pva before tiling. It's the same as a decorator's 'miss' coat on new plaster, as , if you just paint a newly plastered ceiling with a 'vinyl' matt emulsion, there is a chance it will peel off as the vinyl in the paint stops it soaking in the plaster & therefore is on the surface of the plaster
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!