How do I fix peeling paint before repainting?

Short answer

First find and fix the moisture causing it, then scrape off all loose paint, sand the edges smooth, prime bare spots, and repaint. Painting over peeling paint without fixing the cause guarantees it will peel again.

Common causes

Moisture from inside the house pushing out through siding (bathrooms, kitchens, poor ventilation)
Clogged gutters, missing flashing, or siding too close to soil
Paint applied over dirty, chalky or glossy surfaces
Latex painted directly over oil
Painting in cold, damp weather or late in the day

The repair

Scrape until the remaining paint is tightly bonded.
Sand to feather the edges so they don't show through.
Let wood dry fully, then prime bare wood.
Caulk open joints and apply two finish coats.

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Updated September 2026. Always follow the directions on your product's label; manufacturer instructions come first.