I am an employee for a store that carries River Rock and we have had many complaints concerning the streaks that appear even after following the instructions word for word. The company hotline was no help so we decided to figure out how to paint it ourselves. We found that using the regular "V" or "W" technique used to apply regular paint. The staggered strokes used in this technique seemed to smooth out any streaks. Don't be afraid to work the streaks as your painting, blend them out while the paint is still wet.