"Modern paints dry too quickly, and are difficult to brush out," says Dixon, who uses paint additives, such as Floetrol for latex paints and Penetrol for alkyds. "Adding a few ounces per gallon slows drying time and makes the paint more workable," he says. Another problem is bridging. "Latex paints form a skin," says Dixon. "Removing painted tape can tear the skin, resulting in a ragged rather than a sharp line." Lastly, taping takes time. "Learning how to cut in with a brush takes practice, but if you can do it, you'll leave most tapers in the dust," Dixon says. (Cutting in is painting just the surface you want, not the surface adjacent to it — for example, where a wall meets the ceiling.) Although there are mildewcide additives, our pros prefer using bathroom and kitchen paints that have built-in mildew fighters. "These paints will prevent mildew from forming, but they won't kill mildew that's already there," Dixon points out. Because leftover mold spores can live beneath the paint and eventually work their way through to the surface, you should also prep bath and kitchen surfaces. First, wash down the walls with a bleach solution (3/4 cup of bleach per gallon of water) then seal with a stain-blocking primer, such as Zinsser's Bulls Eye 1-2-3 or Kilz's Total One.
When the primer is dry, caulk all small joints (less than ¼-inch-wide) in the siding and trim. Most pros use siliconized acrylics—paint won't stick to straight silicones—but Guertin and O'Neil like the new, more expensive urethane acrylics for their greater flexibility and longevity. O'Neil stresses that it's shortsighted to skimp on caulk. "If the joint fails, you're back to square one." Guertin uses the lifetime rating as his quality guide. "I don't expect 35-year caulk will last 35 years, but it should last longer than a 15-year caulk."
Second: all the tricks of the trade in regard to "cheating" customers is for hustlers and cheaters and NOT established businesses. At the end of the project the job should come out looking professionally painted as specified in the contract. A selected color that takes multiple coats that was not calculated by the contractor should cost more money. It's not the fault of the painter.