Hi everyone. I just finished laying down a new 12" x 12" ceramic tile floor in an above-grade "breezeway," and I'm having some concerns. The slab underneath was out of level, so I put down self-leveling underlayment over glued vinyl flooring, which was structurally sound. I followed the preparation instructions exactly. Just before laying the tile, I noticed several cracks beginning to form in the underlayment, but it still seemed solidly bonded. I covered the cracks with fiberglass tape and thinset, and then layed the tile. I'm now wondering if that was the correct thing to do. Any hints would be helpful...thanks!