It depends on the particulars of the job if brushing or spraying is the best way to complete a paint job. The right selection by a skilled crew matters most, and either way prep work is greatly important. Spraying must be done at the right speed to stay and achieve a slick appearance while not giving mildew a chance to grow into imperfections which brushing might have, and be a good pick for the first coat. This spray first application is called a backroll or backbrush. Colorado Painting will be able to show you what you need and educate you fully on the process be it rolled or sprayed.