I had vinyl flooring put in my bathroom on a concrete slab. The contractor put float down to level it(the power type you mix up then spread on the floor). When he put the float down the first time, the float started to bubble up in several spots when drying. So those areas dried with cracks and bubbles. So he scraped it all off and redid the float and it dried ok except for 2 place which he cut out the bubbles and put more float on it. Then he put the vinyl flooring down. After a few months, my vinyl floor has bubbles in several places and some spots are turning it pink (the vinyl's original color is tan). I have to put in a new floor now- what do you think was the problem? The original vinyl that was there before was fine, just worn out.