PrimeX blisters on tiles.

I decided to complete the tiling in my bathroom with whatever tiles I could find and then repaint using Duram PrimeX which I tinted dove gray for the walls and light gray for the floor. We prepared the tiles by scrubblin each tile using a scrubby and sugarsoap and then washing off several times to remove residue. The paint went on easily and covered very well. It all looks amazing. I left it for a full 24 hours and only started using the bathroom this morning. On the floir, I have noticed the paint blistering where my heels impacted. This is bare feet, not shoes. Ill see how it goes during the week and report.