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Coatings can be thinner, like stains, or thicker, like exterior latex paint. Stains require smaller tip sizes and less pressure, but paints and heavier coatings need larger tip sizes and more pressure. A sprayerâs tip size can refer just to the size of the opening, as in a .015 tip. It might also indicate the fan size in inches, along with the tip opening, such as a 515 tip. In this example, the spray pattern will cover 5 inches and the tip opening is .015.
Roller Naps. Paint roller nap sizes range from 1/4 to 1/2 inches in length. When painting a ceiling, the selection of a roller nap size depends on the surface of the ceiling. In general, a ceiling with a matte, flat, or eggshell finish calls for a roller nap of between 3/8 and 5/16 inches. If the ceiling is more textured, however, a longer nap may be called for.