All paint rollers have removable covers or sleeves that are generally interchangeable with covers of the same width. These covers have fibers or naps different length to suit the type of surface being painted and the type of finish you are applying. For flat wall paint, a cover with 3/8-inch or 1/2-inch nap is suitable for smooth surface walls and ceilings. For heavy stippled or textured surfaces a 3/4-inch nap will do much better at penetrating crevices. If painting really rough surfaces, like brick, stucco or shingles then a 1 1/2-inch nap will be your best bet.
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