To cut a long story short and save a list of several pages: Almost all types of stone, natural stone (quarry stone) and artificial stone (burnt bricks, sand-lime bricks, cement blocks, cinder blocks, etc.) can be treated with Isofin for optimum hydrophobization. There are only two exceptions where Isofin only develops a moderate effect: natural carbonate stone (lime tuff, travertine, marble, dolomite) and sulphate stone (gypsum, barite).
Nevertheless, Isofin can also be used successfully in masonry made of carbonate and sulphate rock. more in the manual.
If you are unsure what type of masonry you have, we will be happy to help you.