G
grumpygrouter
You are absolutely right, White Star will fix natural stone and there is nothing wrong with dispersion adhesives.BAL white star is suitable for fixing natural stone and there is nothing wrong with dispersion adhesives.
Trouble is with dispersion adhesives, they stick by having the moisture absorbed then evaporated away. With a susbtance like limestone or trav, this moisture goes into the tile and then has the possibility of staining the product or bleeding through, giving a not very nice appearance. There are products available that will reduce this bleed and staining problem but they are powdered stuff
Having done my last job of 17m2 of a bathroom with white star, I decided then that it would be the last time I used dispersion adhesive. White Star in particular is a pain to get of tools and the surface of the tiles, but it does stick just about anything.