How to apply emulsion paint
Updated: October 2026
The tin is already in the hall and the wall was painted before. On a sound UK interior wall you clean and fill, cut in, roll with a medium pile while the edge is still wet, and come back for a second coat after the time on that tin. These steps follow Dulux's technique notes, Valspar's wall guide, Dulux's new-plaster advice, the HSE lead page, and the dry-time fields in our [emulsion paint comparison](/hub/paints-and-varnishes/emulsion-paint). We did not time a job on your wall. A qualifying purchase can earn a commission at no extra cost to you.
The tin is already in the hall and the wall was painted before.
The tin is already in the hall and the wall was painted before. On a sound UK interior wall you clean and fill, cut in, roll with a medium pile while the edge is still wet, and come back for a second coat after the time on that tin. These steps follow Dulux's technique notes, Valspar's wall guide, Dulux's new-plaster advice, the HSE lead page, and the dry-time fields in our emulsion paint comparison. We did not time a job on your wall. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Dry time listed | Full cure listed | Pack | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Johnstone's Johnstone's Ballet Slipper matt 2.5 L | 1 hour | 24 hours | 2.5 litres | 9.2 | about £16.30 | View offer |
| Alternative |  Dulux Dulux Matt pure brilliant white 7 L | 4 hours | 4 hours | 7 litres | 8.8 | about £27.05 | View offer |
| Best value |  Crown Crown brilliant white matt 10 L | 4 hours | 1 hour | 10 litres | 7.6 | about £20.87 | View offer |
Before you open the tin
Wash the wall, rinse, and let it dry. Glossy patches need a light key. Fill cracks and let the filler dry before you paint. If the coating might date from before the 1980s, the Health and Safety Executive's lead guidance is to wet-abrade, not dry-sand or burn it off. A stairwell or a damp wall is where a decorator should take over.
Dulux Trade's vinyl matt sheet, citing BS 6150, says water-based paint is not for below 8°C. Johnstone's retail page says not below 10°C, so a Johnstone's tin waits for 10°C in the room. A smashed tub is a return. Litres were decided in the emulsion paint buying guide. The 7 litre Dulux against the 10 litre Crown sits on the best emulsion paint page.
Cut in, then roll
Stir again, and pour a working amount into a tray rather than rolling from the tin. Cut in first with a brush of about 50 mm along the ceiling line, the skirting, and the architrave. Valspar's wall guide is the same order: brush the edges, then load the roller on the ridge of the tray so it is wet without dripping.
For matt emulsion, Dulux specifies a medium-pile sheepskin roller. A foam roller is the one to avoid, because it bubbles. Work in sections you can finish while the edge is wet. Roll a W or an M, then cross it lightly. Once a section has started to dry, leave it. Ceilings use the same roller and a smaller section. Dulux prints two coats, and a strong colour change can need a third.
The second coat
Wait for the recoat time on your tin. Do not average the eight listings. Natural Sage lists 2 hours and Crown's 2.5 litre lists 8 hours. Ballet Slipper lists 1 hour to dry and 24 hours for full cure, against a bullet of 1–2 hours. Crown's 10 litre lists 4 hours to dry and 1 hour to full cure, which cannot both be the instruction. When the fields disagree, wait for the longer figure and test a hidden corner.
The second coat repeats the cut-in and the wet edge. If the old colour still shows, the third coat is more paint.
When you should stop
Stop if the plaster is new. Dulux's rule of thumb is to let new plaster dry for up to four weeks, then use a mist coat of about ten parts emulsion to one part water, or Dulux Sealer for Plaster. Unthinned emulsion on plaster that is still wet is likely to crack and peel. That 10:1 ratio is Dulux's, not a Crown or Johnstone's instruction.
Stop as well if the wall is damp, if paint is flaking back to older layers, or if you are working a stairwell from a domestic ladder. A bathroom that steams is a product choice before it is a technique, on the emulsion paint for a bathroom page.
Common questions
What roller for matt emulsion?
Use a medium-pile sheepskin roller for matt emulsion. Dulux's technique guide pairs that pile with a flat finish and keeps short-pile mohair for silk. Foam rollers bubble and can leave an orange-peel texture, so leave them in the shop. Load the sleeve on the tray ridge.
Do I cut in before I roll?
Yes. Brush about 50 mm along the ceiling, skirting, and frames, then roll the field while that edge is still wet. Valspar's guide uses that order and a W pattern in sections. If you roll first and cut in later, the brush line sits on a drying film and shows darker.
How long between coats?
Use the tin in your hand. Dulux's 7 litre lists 4 hours, Natural Sage lists 2 hours, Ballet Slipper lists a 1 hour dry time and a 24 hour full cure, and Crown's 2.5 litre lists 8 hours. Crown's 10 litre lists 4 hours to dry and 1 hour to full cure, which disagree. Wait for the longer number, and do not start on a corner that is still soft.
Why does the first coat look patchy?
Matt emulsion often looks uneven after one coat, especially over a darker colour or on a tin reviewers already call thin. Dulux specifies two coats, and more when the colour change is strong. Let it dry for the time on the tin, then coat it again. Re-rolling a half-dry patch locks the mark in.
Can I paint new plaster the same week?
Dulux's rule of thumb is up to four weeks for new plaster to dry, then a mist coat of about ten parts emulsion to one part water, or their plaster sealer. Unthinned emulsion on damp plaster is likely to crack and peel. That ratio is Dulux's advice, not a Crown or Johnstone's figure. If the plaster is still dark or cold, leave it.
What if the tub arrives split?
Open the parcel on a surface you can wash. A smashed tub is a return. Do not leave the lid off to thicken what remains, and reorder if you no longer have the litres for two coats. Stop for damp or blown plaster, flaking paint that may pre-date the 1980s, or a stairwell you cannot reach safely. HSE lead advice is to wet-abrade those old coatings, not to dry-sand or burn them.
Related pages
Sources
Public sources from the research digest, last checked on 19 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the display file. The price band is this set, not a market average. No listing was lab-tested.
- SI 2012/1715 Schedule 2, VOC limits for paints (retrieved 19 October 2026)
- Dulux Matt (retrieved 19 October 2026)
- Dulux: painting on new plaster (retrieved 19 October 2026)
- Dulux: paint finishes explained (retrieved 19 October 2026)
- Johnstone's matt emulsion, Paint Direct (retrieved 19 October 2026)
- HSE: lead in old paint (retrieved 19 October 2026)
- Dulux Trade Vinyl Matt technical data sheet (retrieved 19 October 2026)
- EN 13300 scrub classes (retrieved 19 October 2026)