Have a concrete bench and there is a 30mm odd Gap about 3mm deep between the back edge of the sink and the tiled splashback. It fills with water and gets manky.Tried using a waterproof patching cement (as recommended by hardware store) but the shrinkage meant that the water still pooled.Thinking a self levelling filler might work, but don't know which one to choose. Open to other ideas.http://bit.ly/2FXeqOd via /r/DIY http://bit.ly/2R9l0CW
