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Ceiling/knockdown joint flashing

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  • Ceiling/knockdown joint flashing

    I have an issue with a ceiling that I have never come across before. I scraped the popcorn off the ceiling, fix some imperfections, sprayed a knockdown and painted it with white, flat ceiling paint. Every joint flashed through. No problem, seen it before and used a oil blocker over the entire ceiling. Painted it again and it flashed again; butt joint, screw holes, etc. I'm at a loss. What do I do?
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