What a nightmare! I've used a lot of different paints and many different techniques but I have never been so frustrated with a product before. After apply my third coat of Grand Teton, which from what I hear is one of the worst colours to work with, I still had very patchy results with verticle lines. So of course I called the 1-800 number, only to hear you should use more paint. MORE PAINT!!!! I was starting on my 4th gallon in a very small bedroom (only 250 sq. ft.). With over $250 into this room and all my time, I wasn't ready to give up. So I waited for a really cool day, to slow the drying, used a non-Ralph Lauren roller, and applied my last coat. This turned out much better than before but definitely not perfect coverage. Thank God for Home Depots Satsfaction Guarantee!!! In general, the concept of River Rock is great, it's the product that sucks!