Do not paint over peeling areas. First correct leaks, damp, poor drainage, or incompatible coatings; scrape back to a firm edge; wash and sand; prime exposed material; then apply a compatible exterior system within its weather limits.
Step by step
Identify the failure pattern
Peeling to bare substrate suggests adhesion or moisture trouble; peeling between coats can indicate contamination or incompatibility.
Remove the cause
Repair leaks, seal failed joints, improve drainage, and allow damp walls or timber to dry before coating.
Prepare to a sound edge
Scrape, wash, sand, and feather all remaining edges. Treat chalking, mould, rust, or salts with the correct method.
Rebuild the coating system
Prime bare areas with a substrate-appropriate primer and apply the specified exterior topcoats under suitable conditions.
Expert tips
- Avoid painting hot sunlit walls.
- Moisture readings are more useful than guessing.
- Test old painted surfaces for hazardous coatings where relevant.
Common questions
Can pressure washing remove peeling paint?+
It can assist preparation, but excessive pressure can damage the substrate or force water into the wall. Scraping and sanding are still usually required.
Why does paint peel around windows?+
Common causes include failed sealant, poor sill drainage, condensation, end-grain moisture, and weak preparation around edges.
Will primer stop paint peeling?+
Primer improves adhesion and seals some substrates, but it will not overcome active moisture, loose layers, or incompatible coatings.
Sources & further reading
We link to official building-code, government and public-health material where a technical or safety claim needs authoritative context. Local rules and adopted code editions can change.
Stop if the work involves structural uncertainty, hazardous materials, heights, live services, gas, serious water damage, or regulated work. Local rules differ—use an appropriately licensed professional where required.