What causes a latex paint to bubble after it is rolled onto the wall?

I did some minor repairs to a room prior to painting, and after wiping the walls down with a damp cloth I rolled the paint on (latex satin finish) and after a short time bubbles appeared in various places. Some were very small, and others may have been the size of a dime! I had previously painted this wall about 2 yrs ago with the same type of paint.




Answer

This painting problem is called blistering and is usually caused by excessive moister under the newly applied paint film or surface contamination.

It is possible when you wiped down the walls you deposited moister that affected the paint, but this is very rare. A better possibility is some kind of surface contamination. Many things can affect the paint; these include soap and grease. Unfortunately, there is no way to know for sure.

The best way to deal with this paint problem is to lightly sand the bubbled paint, feathering the edges if possible. Spot prime with a good fast drying universal primer and apply some spackle if necessary to hide the bubbled areas. Make sure to reprime the spackle before repainting.






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