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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