It can be confusing to know which Pile or Nap you need when buying a paint roller as it depends on the texture of the wall you will be painting. Flat surfaces such as plastered walls require a Short Nap (6mm) Roller. Short Nap Rollers pick up less paint but allow for easy application and provide a smooth and even finish. Short Nap Foam rollers for painting Flat Doors, or when using a semi-gloss or gloss paint on walls and ceilings. Foam rollers come in a range of sizes from 100mm up to 270mm and are therefore really useful for painting smaller areas with gloss or semi-gloss paints.
A Medium Nap (10mm to 15mm) Paint Roller is best suited to uneven or semi-smooth surfaces and for use with Low Sheen or Flat Paints. Medium Nap rollers pick up a fair amount of paint and allow the user to paint a large area all in one go, which is excellent for painting ceilings and walls. Discovery Painting stocks the following medium nap rollers.