Re: What trowel notch size/shape? | | You should be using a 10mm floor trowel for both wall and floor applications in this case and be using a flexi adhesive cement or a porcel fix cement adhesive, you will have to be really carefull that you use an acrylic primer (bal apd) on the plastered wall as the cement adhesive can react with the plaster causing crystals to form between the two resulting in tile failure |