Understanding the causes of paint bubbling on walls is essential for taking the right preventative measures. While moisture is the most common culprit, several other factors can contribute to bubbling. These issues may occur during the painting process or appear months later. In this article, we’ll explore the potential reasons behind bubbling paint and offer solutions to keep your walls looking smooth.
Why Does Paint Bubble on Walls?
Many factors, including paint type, surface preparation, environmental conditions, and moisture, can cause paint to bubble. Let’s dive deeper into some common scenarios to help you pinpoint the issue.
1-Applying Different Types of Paint on Top of Each Other
Most interior wall paints are water-based, making it possible to layer them easily. However, certain water-based paints create a glossy, slippery surface that can prevent new layers from bonding properly. This can cause bubbling or peeling in the new coat. If the existing paint is oil-based or synthetic, applying water-based paint on top could also lead to problems like peeling and bubbling.
Solution: If the new paint differs from the existing one, lightly sand the surface or use a primer to ensure better adhesion.
2-Painting over Low-Quality or Deteriorated Paint
Older paint of poor quality can develop a powdery texture, reducing the new paint’s ability to adhere. When fresh paint is applied over such surfaces, it may bubble or peel off due to weak bonding.
Solution: Use a high-quality primer to seal the old paint before applying the new coat. Make sure the primer dries completely before proceeding.
3-Painting on Dirty or Oily Walls
Paint manufacturers recommend that surfaces be clean and degreased before painting. Paint will not adhere properly to dirty or oily surfaces and will cause bubbling and peeling over time.
Solution: Clean the wall thoroughly and use a high-quality primer before applying the paint.
4-Painting in High Temperatures
Hot temperatures are a leading cause of paint bubbling, especially on exterior walls during summer. When the surface is too hot, the paint dries unevenly, trapping air bubbles underneath. Interior walls can also experience this issue if the room temperature exceeds recommended levels during painting.
Solution: For exterior walls, paint when the surface is cool—early morning or evening is ideal. For interiors, ensure the room temperature matches the paint manufacturer’s recommendations.
5-Painting on Moist Walls
Moisture is one of the most troublesome issues in painting. It not only prevents paint from adhering but also encourages mold growth. Water from leaky pipes, rain, or upper floors can seep into walls, creating a persistent damp environment. Painting over damp walls will almost certainly result in bubbling.
Solution: Identify and fix the source of moisture before painting. Clean and dry the surface thoroughly, and apply a moisture-blocking solution if needed.
Final Thoughts
To prevent paint bubbling, always prepare the surface properly and follow paint manufacturer recommendations regarding application conditions. Whether it’s selecting compatible paint types, cleaning the surface, or choosing the right time to paint, careful planning will ensure a flawless finish. Addressing moisture problems before painting is especially critical, as damp walls can undermine even the best paint job.
With the right tools and preparation, you can enjoy smooth, long-lasting paint that stays free from bubbles and peeling. By following these tips, you’ll be able to tackle bubbling issues confidently and maintain beautifully painted walls. You may also be interested in these articles on preparing the surface for painting:
