pre-baged render for screeding a floor Waterproofing and Tanking - renders, waterproof screeds, DPM's i have started a swimming pool and mosaic tiled the walls/steps ,now the insulation boards on the floor are uneven ,and they are the only company that will guarantee there product under water !! it is polymer modified any tips on how i can work with it ? ie ruling-off maybe plastic float it's going to be very sticky stuff me thinks any -tip's please !!