Hello. I have decided to use marmox tile backer boards on my bathroom floor. I am told to use a non solvent based flexible adhesive by the supplier of these. I intend to fix porcelain tiles and I am told by the supplier of these to use a powdered flexible cement based adhesive which cures by chemical reaction. Does that mean it is solvent based? In which case unsuitable for marmox? Anything that will suit the whole situation?