I've removed a small area of tiles and plaster from a brick wall in order to fit recessed pipes for a shower. The pipes are now fitted so I need to re-tile over them. I have to match up the level with the existing tiles, so that means I'll need to build the wall out to a depth of 30mm before tiling. The area is around 300mm x 600mm, the tiles are basic 150mm ceramic. What would be the best option for this? It looks like plaster or cement render will do the job but will take a long time to dry (weeks?). After googling, I can see 'Ardex AM100' looks like the right thing ('rapid set, no slump, 2-30mm depth') but I have no experience with it. Thoughts?