The combination of both is the proper way to apply paint on fresh or painted stucco. The following will explain the process of spraying & back rolling and why it is the preferred method for paint applications, especially on stucco surfaces.
When most people think of “spraying”, they visualize utilizing an air pressure sprayer with a pressure pot and air compressor. Like the way a car is painted. This (old fashioned) style of spraying may be okay for painting cars (in an enclosed spray booth environment) but has no similarities to the type of equipment or methods used when repainting the exterior of buildings.
Today’s modern spray equipment utilizes an "airless" high pressure system. The paint is pumped directly from the paint bucket at high pressure (3,200 + PSI) onto the substrate that is to be painted. The high pressure and direct force of the paint minimizes any overspray and applies the paint to the surface with precision and uniformity. When coating non-smooth stucco, a second painter follows directly behind the spray man. Using a (lamb’s skin) roller, he/she spreads the paint out evenly on the substrate, forcing it into all the “nooks and crannies”. Unlike the bucket only rolling application, the amount of paint millage (thickness) decreases as the applicator continues to roll out the paint, producing an uneven thickness in the finish coat. Airless spraying will apply more paint uniformly to a substrate than just rolling.
Windows and other non-painted surfaces are first cut around with brushes and “boxed-out” so that neither the roller nor the sprayer need get too close. All non-painted surfaces are, of course, thoroughly protected.
A professional spray person will do a cleaner, neater, more efficient job than a person simply rolling paint out of the bucket. The overall application process is better when sprayed & back rolled, than when just rolled out of a bucket. All our paints are formulated for "airless" spray application.
In summation, this manufacturer's preferred method of paint application is a spray & back roll technique wherever possible.