Thanks Davy
Yes. talking about the old walls.
But only have a few to replace so was going to use the portland cement/sand/and water slurry then a little cement to back butter the tile.
I just don't want the added latex - it off gasses. (VOC's). Something plain and simple. Have two little ones.
The other part of the wall will last forever (at least long time
The previous owners put some crap bath fitter up over all the tile and they had damaged some of it.
So i pulled it all up and stripped all the glue with hand force (scraper) and olive oil.
Just was wondering if i should do a wet set and let the tiles soak, then add them to the wet cement.