Load flat or eggshell exterior paint color into paint sprayer. Depending on intensity of hue, apply one or two coats of flat or eggshell exterior paint to entire house. Be sure to work your way from top to bottom in a smooth, controlled manner, overlapping each stroke by 8 inches. TIP: When changing exterior color from light to dark or dark to light, start with a coat of primer to ensure proper coverage. Primer is not necessary when a fresh coat of existing color is being applied.
Thorough preparation is essential to ensure a good finish. Contractors might have to fill cracks or holes and remove old paint if it is badly worn, peeling or flaking. They remove all paint and apply a suitable primer to the bare surface. If the existing paint is in reasonable condition, they clean it and rub it with abrasive material to provide a key for the new paint. On new surfaces, such as bare wood or fresh plaster, they apply a suitable seal, followed by a primer coat.