What would cause exterior paint to bubble?

What would cause exterior paint to bubble?

There are many possible causes. The surface might have been dirty or the weather too hot or cold, or moisture could be moving through the wall and pushing the paint off. Applying oil-based paint over water-based paint can also cause bubbles, but we can rule that out because you bought a water-based product.

Does bubbling paint mean damp?

In modern homes, bubbling or peeling paint caused by damp is especially common in steamy areas with poor ventilation such as kitchens or bathrooms.

How do you fix paint bubbles outside?


  1. If blisters go down to the substrate (e.g. the surface that is painted), the cause is likely to be moisture escaping from the surface.
  2. If blisters go down to a previous coat, remove all loose paint (by scraping or other methods), and sand the surface to smooth out any rough edges.

What does it mean if paint is bubbling?

Paint Bubbling & Blistering Paint blisters or bubbles occur when the paint film lifts from the underlying surface. The loss of adhesion between the paint film and surface is usually caused by heat, moisture or a combination of both. This condition eventually leads to peeling.

Will exterior paint bubbles go away?

“Bubbling and blistering can be caused by rain if the paint hasn’t had enough time to dry before a storm moves in, but in many cases once the sun comes out the bubbles disappear,” he says. If your bubbling paint can’t be traced to any of these factors, the culprit may be your roller cover.

Will paint blisters go away?

Not all paint bubbles need to be repaired. Ace Paints, a company in Pittsburgh, Pennsylvania, says some bubbles may appear soon after painting but go down once the paint has dried. Paint bubbles can be removed by simply scraping them away from the wall. A paint scraper or putty knife is suitable for this purpose.

Can condensation cause paint to bubble?

Condensation can also show itself on walls, making them wet to touch and the presence of damp patches. Peeling of wallpaper, paint or plaster. Where there is condensation on the walls, it will most likely cause the wallpaper, paint, or plaster to bubble, peel and flake.

How can you tell if a wall is damp?

These signs of damp include:

  1. A distinctive musty smell.
  2. The appearance of mould or mildew on walls, floors or ceilings.
  3. Walls, floors or ceilings that feel cold or wet.
  4. Water droplets on walls.
  5. Dark or discoloured patches on walls or plaster.
  6. Lifting or peeling wallpaper from moisture in the walls.

At what temperature does paint blister?

If you paint your house when the temperature is too hot, the paint dries too rapidly and the heat compromises adhesion. At temperatures over 90 F / 32.2 C, bubbles and blisters form in the paint. Once the paint cures, it could start to peel away from the surface.

Can you paint over bubbled paint?

FOR PAINT BLISTERING CAUSED BY HEAT: Remove blisters by scraping, sanding or pressure-washing down to underlying coats of paint or primer. Repaint the surface with a high-quality interior/exterior paint (make sure the surface temperature is below 90º F). Find the best paints suited for your project.

How do you get rid of paint blisters?

Bubbles are usually localized in one spot, so you only need to remove the blistering area and not any of the rest of the paint. Rub the area underneath the bubble with sandpaper to smooth the surface. If the resulting surface is pitted or uneven, apply joint compound to repair the wall.

What causes paint to blister?

What Causes Bubbling or Blistering Paint? Blisters or bubbles appear when a layer of paint does not adhere perfectly to its underlying surface, known as the substrate. As the new film of paint dries and pulls away, pockets of air or water form underneath.

Can a builder fix damp?

It’s as simple as this – if the air isn’t properly circulating inside a home, then moisture will not evaporate and this turns into a damp problem. To get help for your damp problem, please contact us at Elite Builders London today on 020 8987 8071.

Does paint bubble when cold?

What causes bubbles on painted walls? Well, the answer could be humidity, low temperatures, and moisture. Damp areas will cause your paint to bubble as well as too cold and not properly heated rooms. But most likely the surface was not sealed properly before painting.

What causes blooming in paint?

Blooming Blooming is the defect caused due to improper ventilation, weathering, defective paint, etc. In this case, dull patches are formed on the painted surface.

What is paint bloom?

A milky white haze or mist formed on the surface of the paint film. Cause. Moisture condensing on, and being trapped in the wet film. This may be due to: Spraying during cold, wet or humid weather.

Is rising damp a serious problem?

Rising damp can be a serious problem, as if left untreated it can lead to structural issues. The damage it can cause to your plaster, flooring and decorative finishes as well as the smell also makes it very unpleasant to live with.

Does homeowners cover damp?

The worse a damp situation gets, the more it’s likely to cost to repair any damage. Most standard buildings and contents home insurance policies do not cover damage caused by damp and condensation. A damp-proof course can run into thousands of pounds if the whole house needs treating.