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Concrete paint bubbling

Our entrance porch is concrete and was painted a grey color when we moved in. Over the next 10+ years, parts of it wore off, showing the original red color. We just had it painted a couple of months ago. The painter scraped off any loose bits of paint and repainted with a high quality paint made for patios Glidden Porch & Floor, Latex Satin. Immediately, bubbles began forming, mostly over the areas where the original paint showed through. They have since gotten bigger, and some have cracked... Our painter said it was due to the concrete off-gassing and that there wasn't anything he could do about it. So I thought I'd ask the experts!

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2 Answers from these members:
Manage My Life
I am understanding your concern over the issue that you are having with the newly painted concrete. I have researched your issue and i have placed two links that state what would be the best process to go with painting concrete.
by Manage My Life
April 19th, 2011
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Manage My Life
A home improvement project that goes sour is obviously frustrating. It is unlikely that your painting contractor does not have a bit of responsibility for the undesirable result. Concrete is a porous material and the cleaning and preparation of the material is crucial to obtaining a flawless result. Concrete needs to "breathe", "gas", or exhale in some fashion and the application of a sealer, stain, or paint must accommodate concrete's need to breathe. Some painting contractors would recommend painting at the end of the day when the temperature is at its high point as then the gasses within the concrete have expanded and exhaled. This flow, if not timed, correctly or if the paint used is not of the right type/quality then bubbles or blisters in the paint may occur. Glidden's online specifications are not detailed enough to determine if the choice was best for the project. You may want to contact them directly to determine if there was another step that was missed or if better surface prep is necessary to eliminate the bubbling.
by Manage My Life
April 19th, 2011
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