Somewhat OT: A Painting Question

I love doing electrical, plumbing, carpentry, furniture, finishing ... but I just HATE painting - probably because I'm very slow at it. I have this weird problem that I could use some Wreck Smarts on:
The front foyer of a home is done entirely in drywall. It was initially primed/painted almost 20 years ago and has since been repainted at least once. At one point or another, a leak developed above foyer ceiling. Although the leak was subsequently fixed, it left what appears to be some kind of brown/mineral discoloration on the ceiling and not amount of paint seems to cover it. If I paint it, it dries, and the stain reappears.
Ideas?
TIA,
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On 6/09/12 11:29 AM, Tim Daneliuk wrote:

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Froz...


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On 6/9/12 10:52 AM, FrozenNorth wrote:

There are Kilz and/or Zinsser primer that are shellac based. Get one of those and prime the area... it might take two coats.
Isn't Leon our local Zinsser B-I-N advocate? :-)
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On Sat, 09 Jun 2012 11:04:35 -0500, -MIKE- wrote:

Well, if he isn't, I'll be glad to take over :-). I've used B-I-N on stains left by roof leaks that kept re-appearing until I used the B-I-N.
Great stuff.
On a related topic, I'm replacing some trim boards on our place. The originals were rustic, so I bought cedar fence boards and cut them to width. I painted them first with B-I-N on all sides with multiple coats on the end grain and an extra coat on the back side. Then I painted the other 3 sides with the trim color and installed the boards with screws.
That's one job I don't expect to have to do again!
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On 06/09/2012 08:52 AM, FrozenNorth wrote:

One word - Kilz
<http://www.kilz.com/masterchem/v/index.jsp?vgnextoidbde90033f9ff110VgnVCM1000008a05d103RCRD
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What he said. You need a stainkiller paint or primer of some sort, anyway. Doesn't have to be Kilz brand specifically, though that's the easiest one to find. Sherwin-Williams makes one that they call "StainBlocker" or something similar, which I've used with great success. Kilz also works very, very well.
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On Sun, 10 Jun 2012 22:22:06 +0000 (UTC), Doug Miller

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On Sun, 10 Jun 2012 23:17:27 -0400, clare wrote:

Careful. If you mean the Zinsser white and amber shellacs, they contain wax. That may or not be a problem, depending on what finish you overcoat with. SealCoat is a lot safer. And I suspect B-I-N is dewaxed, although I haven't checked it.
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On Sat, 09 Jun 2012 10:29:06 -0500, Tim Daneliuk

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On Sat, 09 Jun 2012 10:29:06 -0500, Tim Daneliuk

Kilz the oil based version best bet, but I hid some cieling stain recently with Kilz water based primer.
Mark
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