Wood Siding Paint Bubbling

Bubbles form as the result of a chemical reaction.

Wood siding paint bubbling.

If there is any moisture in the wall wood the dark paint will cause the siding to heat up in the sunlight which will draw the moisture to the surface. Your dark paint might also be a contributing factor. If your siding has been treated with linseed oil in the past prime and paint with oil based products. Blistering paint is identified by small to medium sized bubbles or blisters under the paint film.

The expanded vapors cause bubbling under the paint. Dark colors of exterior paint can absorb more heat and consequently have more bubbling problems than light colors of paint. The paint was applied when the wood was damp causing trapped moisture to expand the paint film. If that s not an issue you have two options.

I would dismiss that thought if your previous dark paint jobs have held up well. Never apply oil based paint over a latex base. Keep scraping sanding priming and repainting as bubbles appear or strip off all the paint that s bubbling and start over. Watson said that if he.

Moisture can also cause bubbling problems in exterior paint. Moisture blistering can be caused by the migration of water through an interior wall to the exterior thus pushing the paint off of the surface. It is possible to use latex paint over oil based primers and paints but it s better to stick with one type of formula. Heat vapors that become trapped inside the fast drying paint begin to expand.

This problem is far more common when paint is applied to a hot surface. Heat blistering caused by painting in direct sunlight on a surface that is too warm. This applies to smooth surfaces with out texture like smooth wood siding. For rough surfaces stucco and embossed masonite siding only scraping and or wire brushing is possible.

It is most commonly seen on wood siding and trim. Bubbles caused from a loss of adhesion and lifting of the paint film from the underlying surface. Fixing exterior blistered paint for small areas remove bubbles by scraping then sand the edges of the repair to create a smooth surface. Paint was applied in direct sunlight on a hot surface which trapped solvent vapor as the paint dried too quickly.

Then clean dry prime and paint the. If the blisters go down to the substrate you will need to remove the source of moisture if possible. To repair bubbling caused by the use of an improper roller cover eliminate the paint bubbles using the scraping and patching method outlined below.