Why the roller sleeve you choose actually matters

Nap length matched to texture

A short nap around six to nine millimetres suits smooth plasterboard and lining paper, giving a fine, even stipple with minimal texture. Medium naps around twelve millimetres handle lightly textured walls and most standard emulsion work. Long naps of eighteen millimetres or more are needed to get paint into heavily textured render or pebbledash without leaving the high points starved of material.

• Short nap for smooth plasterboard and fine finishes
• Medium nap for general wall and ceiling emulsion
• Long nap for textured render, pebbledash and Artex

Fibre type changes the finish, not just the feel

Woven and knitted synthetic sleeves generally give a smoother, more consistent release of paint than cheaper foam or low-grade sleeves, which tend to leave bubbles or an uneven stipple. On a visible feature wall or a client-facing reception, the sleeve quality is as much a variable as the paint itself.

Solvent-based versus water-based compatibility

Some sleeve materials are not compatible with solvent-based products and will swell or shed fibres into the paint film. Checking the sleeve's rated compatibility before use avoids finding loose fibres baked into a gloss finish after it has dried.

• Mohair or short synthetic pile for solvent-based gloss and eggshell
• Woven polyester sleeves for water-based emulsion and satinwood
• New sleeves washed or de-linted before first use on fine finishes

Getting consistency across a large area

On a big job with several decorators rolling different walls, using the same sleeve type and nap length across the crew avoids one wall reading a slightly different texture to the next under side light. It is a small detail that only becomes visible once the job is finished and the light changes through the day.