I'm a home owner who's used the Duchess Satin with beautiful results. The deep smooth lustrous sheen is easily achieved using a High Volume Low Pressure (HVLP) sprayer. I bought one at Home Depot (not too expensive either) the model is a Campbell Hausfeld Easy Spray, (HV200000LE) which operates at a slightly lower pressure than RL recomends, but works perfectly. The paint must be thinned by 10% as RL instructs. Three or four of these thin coats are very fast and easy, and this doesn't use much product (I think even less than if you used a roller for two coats!). Hope this helps.