Why Does Paint Bubble Up On Walls

To remove the bubbled paint on a concrete porch and begin repainting:

Why Does Paint Bubble Up On Walls. What could have caused this effect long after my paint job and how do i eliminate it? How do you fix bubbles in the wall?

No White Walls For Me
No White Walls For Me from www.addicted2decorating.com
Could it be because the window is pressed on the wall too much? We've got more to go still, but the guest my mother once painted the walls a yellow/orange color and gray, and it looked really nice. Paint bubbles can form long after the paint has dried.

It may also be a case of the old paint bubbling up as it gets wet, revealing a bonding problem in the original coating.

If you want a clear coat over paint, a better choice is spar varnish over oil base paint and arcylic urethane over latex. Get some sandpaper and rub it across the wall after you have cleaned it to rough it up a bit. < paint bubbling & blistering. I am painting my walls, and bubbles are appearing.