There is no use for me to add to the bashing of River Rock paint, however, there should be some disclaimer if not on the can, then from the paint pros at Home Depot. All they told me was to use the special roller and follow the directions. I have painted for over 30 yrs. and never had problems like this.
Here's a tip if you happen to get some on your stucco ceiling...use a little fine sandpaper and it will come right off. Unfortunately the same can't be said for molding. I am going to try getting my money back .