Around the kitchen sink we have a tiled area that's built up about 20 mm from the wall with some very hard material - no idea what. I need to chisel off some of this to make way for the end of a worktop, and the result isn't going to be neat. After fitting the worktop, I'll need to build the damaged area up to the same height and fill in gaps before re-tiling. The affected area will probably be about 1 m x 150 mm and 20 mm thick. Can you recommend a specific product/material for this?
Dave
Dave