Why exterior paint chalks
Powder on an exterior wall is a surface condition to evaluate before recoating.
Surface care guideThe practical answer
Chalking is the powder that can rub off a weathered paint film. A new coating may not adhere well to a powdery surface. Inspect the wall for other failure, clean and prepare it as appropriate, then select primer and finish based on the substrate and remaining coating.
What to know
Chalking is a weathering effect that can affect how a new coating bonds. The surface may need cleaning and preparation; the right treatment depends on the coating and substrate.
Before you request a scope
- Rub a dark cloth across the paint to see whether powder transfers
- Inspect for peeling, cracking and moisture at the same time
- Confirm cleaning and primer needs before repainting
Good questions.
Does every chalky wall need the same primer?
No. The coating and substrate condition determine preparation and product choice.
Can chalking appear with peeling?
Yes. Inspect the whole surface rather than treating the powder as the only problem.
Further reading
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Tell us what needs attention.
Share the surface, the location and what you would like to change. Photos are a helpful place to start.