Bubbling paint can be a great source of frustration when painting a home or building. Bubbling occurs from a chemical reaction during the painting process, usually when the surface beneath the paint is hot. When the top layer of paint dries, it creates a barrier that stops the paint solvents from releasing. The hot bottom surface then allows those solvents to vaporize, creating a gas that pushes the paint away from the wall. Several easy steps can be taken to prevent bubbling.
Watch the temperature when painting. Avoid painting when it is warmer than 85 outside.