Excellent! Sticks very well. I've used several other brands of alkali resistant tape and I love this one. It's sticky, it's soft, and its fibers can be twisted a bit, allowing it to shape into corners, around curves, and into uneven areas. All other ribbons had a hard grid where the "squares" in the ribbon remained square, so the ribbon ended up with small creases that stuck out. Very annoying. I was also able to peel off this tape and then put it back and it stuck after the third time. Some of the other tapes didn't stick the first time. fantastic things. I used Hardibacker on the seams, along the edges and to create a base to create a layer of grout for some of the mosaic tiles. They were a bit thinner than the rest of the tiles so they needed a base to install them on. The tape worked great to keep the bottom of the grout level.