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Your problem could be a number of things. Is it an old plaster wall you're painting? That's usually the problem. If not, did you have wallpaper removed? Anyway, the ideal solution, the only way to get rid of it is by using a FLAT OIL PRIMER! Let it cure for a day or 2 and then you can paint with latex or oil. The slight chance bubbles come up again just plaster and then prime with oil again. A lot of the time it's the glue reactivating from the wallpaper/vinyl or moisture in the wall (usually an exterior wall) any problems email me @ mortonpainting AT hotmail.com
As Rasta said it may be that the paint you are painting over is oil based and what u are using is latex. If that is the case, prep by sanding and a correct primer will help alot. Have you just tried putting a pin in the bubbles and deflating them?
It might be that the paint has air bubbles in it before it gets on the brush or roller. Try "dropping" the can a couple of inches above the floor a few times to get the air bubbles out. Maybe that will work!
We had that problem years ago when I lived at home. My dad used to paint with oil based paint all the time. Then we went to latex paint and there was a huge problem with bubbles. We also had plaster walls. He had to sand the walls and put a skim coat of plaster on the walls then a sealer then paint. My mom was very upset through this whole thing. The next time he painted he thoroughly washed and dried the walls then primed them and painted.
I would call the store and talk to someone about the problem that you're having. Call Home Depot and talk to a professional.
Before wasting any more paint on the walls and flushing your money down the drain. See if the wallpaper can be removed before painting.
If it is too much work to remove the wallpaper, you will have to slit the wallpaper in areas so that the air escapes before applying any paint. It would be like bursting a balloon with a pin.
Once there are no more air bubbles under the wall paper, you shouldn't have any more problems in applying the paint.
Check out the following:
www.kellymoore.com/site/solutions
This site has photos of paint problems, possible causes, and solutions.