Pile Height or Nap:
Refers to the thickness of the material used on the roller and determines how much paint the roller will holds. Longer holds more. Generally, the best rule to apply to most painting jobs is the glossier the paint and the smoother the surface, the shorter the pile you should use.
- Short nap 4 to 8mm: The best kind to use with glossy paint, since it leaves a thin, very smooth coating.
- Regular nap 10 to 18mm: More suitable for use with water based paints on smooth and semi-smooth surfaces such as wall boards and cement render.
- Long nap 20 to 32mm: Suitable for all paints on semi-rough surfaces such as brickwork and masonry. Works a heavy load of paint into the irregularities of a textured, damaged or extremely porous surface and can create a deeply stippled effect on any surface.