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Problem Solving Blistering Blistering is the formation of bubbles resulting from localized loss of adhesion and lifting of the paint film from the underlying surface. Cause: Rust, oil or grease on surface Vapor expanding between the coated surface and the film due to humidity, construction defects, or lack of effective vapor barriers, moisture condenses on or saturates wood siding. Painting with solvent-based coatings in direct sunlight on a surface that is too warm. This problem is prevalent in darker colors, due to absorption of heat, more than light colors. Solution: Degrease the surface properly before painting. If caused by moister, repair loose caulking and install vents or exhaust fans, which will allow moisture from in the house to evaporate before penetrating wood siding. Allowing moisture to escape via open windows can also be an option. Sand and scrape peeling paint to bare wood or surface. If the blisters do not go all the way to the substrate, then the blisters are likely from painting a warm surface in direct sunlight or exposing the paint film to excessive moisture. In any case, sand, scrape and then prime any exposed bare wood. Coat with a top quality acrylic latex exterior paint.