Oh, so now we're talking levels of adhesion? So you spend unnecessary time backrolling to achieve a better than necessary level of adhesion? OK, fine.My understanding is that back rolling creates a continuous surface so the pinholes that develop when spraying are covered. This completes your coverage area resulting in better adhesion of the paint. Why aren't power rollers used more often? Seems to me you'd save a ton of time on all that prep you have to do when spraying.