A thinner nap provides a smooth quality finish using water based or oil based gloss or semi-gloss paints. They are designed to hold a small amount of paint, which also helps in gaining that ultra smooth finish. These are to be used mainly for painting doors or cupboards.
Helps to achieve a very smooth finish. They are designed for painting feature walls or walls where you want to get a really smooth finish with less “roller stipple than 12mm rollers”. You can actually use an “All Purpose roller” on all surfaces in your home, although you will always get a better finish by using the special nap roller designed for a specific surface and purpose
The most commonly used roller for painting all walls and ceilings around the home. They are designed to hold a fair amount of paint, usually for applying flat or low sheen paints. Quality 12mm nap rollers will apply an even paint film to your walls and ceilings and give you a great finish, without splattering paint all over you and the floor. Professional painters actually use 20mm nap rollers on ceilings, and 12mm nap rollers on walls.
Rough and Textured Surface Rollers have a thick 20mm nap, and are specifically designed to paint rough surfaces like bagged brick, render or brickwork itself. They are also designed to hold large volumes of paint, as these surfaces are very thirsty to paint. The thick roller helps on these surfaces, not only to put on more paint, but also to “get into all the deep surfaces” that these rough surfaces have.