tck1985

I’m preparing NoMorePly cement boards to be microcemented over as part of a bathroom renovation. FST has been recommended on here to fill the screw heads / boards joins. I’m struggling to get hold of any locally and the delivery cost online is as much as the product. Can anyone recommend a suitable alternative? Would Toupret fine surface filler work ?

@SimonD @shirebuild thanks for the really useful posts. I'm about to start on our bathroom using microcement (Cehmer) for the walls behind the bath and the shower enclosure. I am also getting worked up about how to get the interface between the bath and particularly the shower tray completely watertight. I'm using 12 mm NoMorePly cement boards as the wall substrate. If I was tiling I would use a rubber adhesive vertical upstand on the wall edge or top edge and use tanking compound to stick this to the backer board. Products like classiseal (https://waterproofyourbathroom.com) or no more leaks (https://www.nomoreleaks.co.uk) respectively> However because microcement is so much thinner than tiles + adhesive I'm not sure this will work. I don't think I have the option to drop another board onto the tray / bath edge. I'm wondering about finishing the microcement below the bath edge and then sticking the bath to the finished microcement with CT1 adhesive and then run a finishing bead of silicone. I could potentially do the same for the tray but I feel the risk of leaks is higher for the shower area. Any comments / other ideas gratefully received. Do you think the CT1 approach is reasonable? Do you think a tanking membrane approach could work and ? be feathered in with tile adhesive and then covered in the Microcement?