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Moisture on a balcony ceiling, here we will show how to repair the damp spots on an external balcony ceiling. Moisture always tends to spread and the longer it is delayed, the more expensive the repair is, so it must be repaired immediately. First we need to find the cause of the moisture, that is, where it comes from, fix it, and then deal with the balcony ceiling. First we will scrape off all the paint and plaster that has swelled from moisture. Then we prime the surface, make putty, and putty well what we removed by scraping to protect it. We sand the putty surface with sandpaper. We re-sand and apply two coats of acrylic paint. Moisture on a balcony ceiling