I had a new ceiling put up about a month ago and after a week started to paint emulsion on to it. The first coat went up fine, but the 2nd coat has started to blister. The guy who put the celing up said i could just paint on it but now i realize i may have needed to put sealer or primer on the plasterboard before. I guess my questions are how do i stop the blistering and can i put sealer on top of paint or do i have to take all the paint off?
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