So far, so good....
I tried this adhesive as an alternative to finding and hiring a tile contractor to fix my tile floor where it had cracked, gave with pressure, and sounded hollow.  The Fix-A-Floor repair process was straightforward, well-explained, and easy.  The floor still sounds a bit hollow when we walk across it, but it no longer gives with pressure and I was able to repair the crack with grout--so there is no longer any visible sign of the problem.  I would recommend this product.
Rating: 4 stars