Roller sleeves are sold in short, medium and long nap lengths. A short nap, usually about 5 to 8mm deep, does not hold as much paint as the others, but is the best kind to use with glossy paint since it leaves a thin, very smooth coating. The all-purpose medium nap, about 8 - 12mm deep, holds any type of paint well and produces a soft-looking stippled effect. The pile of a long nap, about 20mm, 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.
Preparing for roller painting:
Rollers need no special preparation unless you are using gloss paint and a new, fluffy short-nap roller. In that case, prime the roller by sloshing it in soapy water to remove loose strands of material. Rinse thoroughly and make sure the nap is dry before you begin. For most rooms, a 1.2 metre extension handle is all you will need to reach high places. Loading the roller with paint
Use a roller tray: Crimp a sheet of aluminium foil securely round the rim of the tray. Half fill the well of the tray with paint and dip the roller in. It should be a little less than half submerged. Lift the roller and roll it down the sloped grating two or three times - but not back into the paint. Dip the roller into the paint once more and roll it on the grating until the cover has been evenly saturated. Do not overload the roller or it can drip and slide, producing an uneven coat.
Painting action: Start with a Zig Zag: To paint a ceiling, begin about 1 metre from the corner and roll towards the corner - the first stroke with a newly loaded roller should always be away from you. Without lifting the roller from the surface, continue to make a “W” pattern about 1 metre square (Fig 1).
To paint a wall, push the roller upwards on the first stroke - away from you - and complete the “M” pattern (Fig 2). The initial strokes spread the heaviest part of the paint load evenly over the section.
Filling in: After completing an “M” or a “W”, begin filling in a 1 metre square by criss-crossing strokes of the roller without lifting it from the surface (Figure 3). Each stroke should be about 450mm to 600mm long. Use even pressure to avoid bubbles and blotches, and stop when the entire section is evenly covered with paint. Moving your roller in one direction may produce more of a stippled effect than moving it in the other . Bear this in mind when doing your final strokes.
For further expert advice consult the qualified Team Members at your local Bunnings Warehouse.