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I had a leak in my roof and now a water stain on my ceiling. My ceiling is not painted. Can I seal the stain with a primer and then cover it with thinned joint compound so it matches the color?

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The affected drywall may be compromised. If it gets wet enough, the drywall under the paper loses it's integrity and expands a little. You could cut out the spot and put in new drywall, then tape and mud the edges. I never put joint compound over primer.

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