What the heck is going on with my ceiling?

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Tellebot

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I finally got around to finishing replacing the detached drywall tape on my kitchen ceiling. I retaped, mudded, sanded, wiped dust, and primed. I didn't prime the whole ceiling, since I'm just going from white to white and the previous owners painted the whole house shortly before we bought it.

I primed yesterday, and started painting today. The white ceiling paint is going on gray over the areas where I didn't prime, and stark white where I did prime. Why is this? I've used this same ceiling paint in 3 other rooms with no trouble, although this is a fresh gallon. Is there something wrong with the new paint? Or the old paint? Something else? Both the primer and paint I used are water-based; could the old paint be oil-based?

In the pic, from left to right: the unprimed ceiling someone else painted, the area I just painted on top of the unprimed ceiling, and the paint over the area I primed.
View attachment ImageUploadedByHome Repair1427989897.137381.jpg
 

nealtw

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It may have done the same in other room, with out patches, you wouldn't notice. Once dry do some tests with another coat.
 

kok328

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perhaps something is bleeding through (grease, smoke, etc.). The only fix is to prime the entire surface and then paint.
 
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chrisn

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I hope he comes back and tells us it all dried out just fine. If not then kok328 has the right approach
 

Tellebot

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The second coat dried much more evenly. Starting a third coat. That's what I get for trying to save myself time by only priming where I patched, I guess. But at least it looks like it'll all look okay...eventually.
 

slownsteady

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The second coat dried much more evenly. Starting a third coat. That's what I get for trying to save myself time by only priming where I patched, I guess. But at least it looks like it'll all look okay...eventually.
It may have more to do with the quality of the paint or how well you spread it. I have spot-patched successfully on a ceiling.
 
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