I am looking to tile my kitchen. This will involve knocking the old tiles off the wall (a process that I have already undertaken in order to fit new units to the existing setup for the time being). Upon removing these tiles I invariably remove the thin layer of plaster that lies underneath them, exposing the wall itself (a sandy-like substrate).
I believe it is ok to apply adhesive directly to the wall itself rather than plastering beforehand? (in fact I have read that it is almost preferable). Obviously the surface that I am leaving to tile onto is devoid of any large imperfections (none too large in my opinion to be compensated for by the adhesive). I will of course remove any unsound material and endeavor to make the surface as even as is possible.
Is this approach likely to cause any problems?
By my current plans the tiles to be placed are fairly small. In the order of 200x300mm.
I also intend to tile the floor. Tiling onto an existing hardboard lining. Unfortunately the hardboard is "shiny-side" up but is old and worn. Will this be a problem for adhesion? can I create an acceptable surface onto which the adhesive will bond without ripping up the hardboard?