Hello all - I am writing from Florida where I'm renovating a 1960's house with a sunken, step down tub. It is cut into the concrete slab and has concrete walls that were previously tiled. I don't want to re-tile it so looking at options; plaster? or micro cement? reconcrete and seal it? I have found a great plasterer, he does pools, who's willing to help with install but the swimming pool products he's used to are not applicable as they stay wet. Any product and install advice would be much appreciated. No one seems to use micro cement over here so I'm stuck. Thanks very much.