I am a RL Advanced Trained Painter. I have used river rock and suede many times over the years and get great results. The key is definitely in the application- both technique and equipment. The reason these paints are dificlut to work with is the textured beads in the paint. These beads tend to bunch along the edge of conventional rollers and don't work well with brushing unless you are very careful. I would be happy to share my tips and techniques with anyone who needs them.