I have a shower room and the tiles were originally fixed directly onto plasterboard. As such there is now significant wet rot and moulding. I want to replace the tiles with shower walls but need advice as to how best to seal off the damaged plasterboard? A builder friend who's going to do the work has suggested something (I think he called) Tanni Gum?? Never heard of it and he's never used it before either. Has anyone heard of it and is it any good? Thanks
