Paint Peeling or Bubbling: Find the Cause, Then Repaint So It Lasts
Peeling and blistering paint is usually caused by moisture, painting over dirt or gloss, or incompatible paint layers. Diagnose it first, then scrape, prepare and repaint correctly.
- Difficulty
- Moderate
- Time
- Half a day to a weekend, depending on area
- Typical cost
- About $30–$80 for primer, paint and supplies for a typical wall
Peeling, flaking and bubbling paint all mean the same thing: the paint has lost its bond to the surface below. Painting over it without finding out why gives you a fresh coat that fails in the same place. The pattern of failure usually points to the cause.
Lead first, in older homes
If your home was built before 1978, stop before scraping. The EPA notes these homes are more likely to have lead-based paint, and that deteriorating, peeling or chipping lead paint is one of the most common sources of lead exposure at home. The EPA also says any renovation, repair or painting in a pre-1978 home with lead-based paint can easily create dangerous lead dust. Test the paint with an EPA-recognized test kit or a certified inspector. Paid contractors disturbing paint in these homes must be certified under the EPA’s Renovation, Repair and Painting rule.
Diagnose the failure
| What you see | Likely cause |
|---|---|
| Bubbles or blisters that contain water, in bathrooms or on exterior walls | Moisture behind or on the paint |
| Peeling in sheets near ceilings or windows in a bathroom or kitchen | Humidity and condensation |
| Paint peeling off in strips, exposing glossy paint below | No preparation over gloss, or latex over oil-based paint |
| Flaking in small chips across a wall | Paint applied over dust or dirt |
| Blisters on a sunny wall soon after painting | Painting in direct heat; top skin dried too fast |
| Peeling around a stain | Water leak above or behind |
Test for latex over oil
Wipe a small area of the old paint with a cotton ball dampened with rubbing alcohol. If paint comes off on the cotton, it is latex. If it does not, it is likely oil-based. New latex paint over unprepared oil-based paint is a classic cause of peeling, and needs a bonding primer in between.
Fix moisture first
The EPA’s mold guidance stresses that the key to mold control is moisture control, and recommends drying water-damaged areas within 24 to 48 hours. For paint, the same rule applies: fix leaks, run bathroom and kitchen exhaust fans, and let walls dry completely before repainting. The EPA also advises not to paint or caulk moldy surfaces; clean and dry them first, because paint applied over mold is likely to peel.
Repair the area
- Scrape all loose and flaking paint with a scraper until only firmly attached paint remains.
- Sand the edges where bare surface meets old paint, so the transition is smooth and will not show through.
- Clean the area with mild detergent and water, rinse, and let it dry.
- Patch gouges with spackle or joint compound and sand smooth.
- Prime. Use a bonding primer over glossy or oil-based paint, a stain-blocking primer over water stains, and a primer suited to bare drywall or plaster where the surface is exposed.
- Paint with two thin coats, following the can’s recoat time.
Peeling ceilings over a shower
When paint peels in sheets from a bathroom ceiling directly over the shower, the cause is almost always condensation soaking the paint from the room side. Repainting with the same paint will fail again. Improve ventilation first, then scrape, let the ceiling dry for several days with the fan running, prime with a primer suited to high-humidity areas and finish with a bathroom-rated paint.
Choose the right paint for the room
Bathrooms and kitchens benefit from paints labeled for high-humidity areas and from satin or semi-gloss finishes, which resist moisture better than flat paint. The EPA notes that paints and paint strippers release volatile organic compounds, so ventilate well while painting and drying.
Common mistakes
- Painting over peeling paint without scraping.
- Skipping primer over glossy or oil-based surfaces.
- Repainting a bathroom without fixing poor ventilation.
- Dry-sanding paint in a pre-1978 home without testing for lead.
When to call a pro
Call a certified lead-safe contractor before disturbing paint in a pre-1978 home where lead has not been ruled out. Call a contractor or plumber when peeling is caused by an active leak, or when blistering covers large areas of exterior walls, which can indicate moisture problems in the wall assembly. Persistent moisture and mold covering more than about 10 square feet is the point at which the EPA suggests considering professional cleanup.