S
Spud
There are many good companies selling sealers , the ones I trust are Lithofin, Fila and ltp, the reason is because they have worked reliably on the jobs I have tiled over the past 28 years I have been in the industry, I have seen other sealers used on jobs and they have failed to do what they are supposed to, one sealer brand we were supplied on a job took 10 coats as opposed to 3 coats of fila , even after 10 coats the stone wasn't sealed enough and needed to be stripped and redone with fila , Lithofin stain stop has been at the top of the tree for many years and still is one of the best products on the market in my opinion , back this up with there technical support and it's why they are the trusted brand for many tilers