How to prepare walls for painting: the steps that make the finish last

1. Clear and protect

Move furniture away or cover it. Lay dust sheets, remove switch plates and mask edges.

2. Check for problems

• Damp or mould: find and fix the cause before painting. Paint will not cure it.
• Flaking or bubbling paint: scrape back to a firm surface.
• Cracks and holes: fill them.
• Staining from smoke or water: seal with a suitable stain-blocking primer.

3. Fill and sand

Fill holes and cracks with suitable filler, let it dry, then sand smooth. Wipe away the dust.

A note on old paint

Houses built before the 1980s may have old lead-based paint. Do not dry-sand or scrape it. If you suspect it, get advice before disturbing it.

4. Clean the walls

Wash with sugar soap or a mild cleaner to remove grease and dirt, then let the wall dry fully.

5. Prime where needed

New plaster, filled patches, stains and strong colour changes need primer. Use the product recommended for the surface.

6. Paint in good conditions

Paint when the room is dry and not too cold. Cut in edges first, then roll, and keep a wet edge to avoid marks.

Mistakes to avoid

• Painting over damp or mould.
• Skipping cleaning and sanding.
• Rushing the drying times.

See the colour first

Upload a photo of your room to GlowUpp to see AI-generated colour ideas, then test real samples. Always ask a qualified professional before moving gas, electrics or plumbing, or changing anything structural, and check your lease or local rules if you rent or live in a conservation area.