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adgjqetuo 06-18-2013 08:18 PM

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A PVC boot on my roof had a very slight leak but I didn't notice it until way later when a light yellowish stain started to form on an unused bedroom ceiling. I've since fixed the boot and am now trying to cover up the stain. The ceiling still has that cheap builder white paint on it.

The spot was very light in color, but fairly large in size (about 24" x 6"). It didn't ruin the drywall - just colored it.

My initial plan was to spot treat the area with a coat or two of ceiling white and then paint the entire ceiling once it's covered.

Well it's not working as I had planned and I'm on my 4th "spot coat" and the stain is still showing through.

What steps should I take to get this covered so I can get the whole ceiling painted?

I'm heading to HD during lunch tomorrow so any suggestions would be great!

It's a little hard to see in the pic, but defiantly still there.

Jmayspaint 06-18-2013 08:46 PM

Your going to need an oil based stain blocking primer. Water stains will come through almost anything else. (There are some new latex primers that work to some extent, but oil will definitely work)
Zinsser cover stain or an equivalent primer will work best. Even Kilz original should work for that.
If you don't want the hassle of rolling oil base, you could use the 'Up Shot' spray cans. Zinsser and Kilz both make them. It's a spray can of the primer you need that sprays straight up. Would probably take a few cans for that big of an area.

Check out a similar thread from a few days ago.

joecaption 06-18-2013 08:48 PM

It needed to be cleaned then sealed with a sealing primer before painting.
Zinsser 123 works for me.

adgjqetuo 06-18-2013 09:02 PM

238 Attachment(s)
Is this the stuff you are referring to?

Jmayspaint 06-18-2013 09:03 PM


Originally Posted by joecaption
It needed to be cleaned then sealed with a sealing primer before painting.
Zinsser 123 works for me.

Hey Joe. Have you tried the 123+ ? I've found it to be more reliable for hiding water/tannin stains than the regular 123.
Latex stain blockers that work are so new, I'm still hesitant to recommend them. I hope we can put the oil stuff away for good someday.

Jmayspaint 06-18-2013 09:08 PM


Originally Posted by adgjqetuo
Is this the stuff you are referring to?

Yes, that's the stuff. The ones pictured are regular spray cans. They could be used but its hard to spray a ceiling with them.
There is a version in a can that sprays vertically instead of horizontally. Lot easier, especially for a big area.

Try looking for 'up shot' cans.

chrisn 06-19-2013 03:24 AM

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like this

ToolSeeker 06-19-2013 05:27 PM

I like a spray can of BIN for water stains. Since a cheap builders paint on lid you may end up painting the entire ceiling to get it to match.

jeffnc 06-19-2013 09:09 PM

It technically doesn't have to be oil based, but it shouldn't be water based. The basic rule of thumb is water based stain blocker for oil/grease type stains, and oil based stain blocker for water type stains. But BIN is shellac/alcohol based which is not oil, but is not water based so it will block water stains. The spray can is very handy, but the particles get farther than you think, so cover plenty of the surrounding area.

Jmayspaint 06-20-2013 05:53 AM

I like BIN too. It can create shiny/flashy areas that will show through the finish if used for spot priming.
I have heard from other pros that sanding the BIN spots before applying finish will eliminate that.
BIN is the most effective stain blocker that I know of. When I use it, on really tough staining, I usually prime over it again with cover stain to prevent flashing through the finish. Haven't tried just sanding it yet.

adgjqetuo 06-20-2013 08:38 AM

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Ok so I primed that area with the spray can suggested with 2 coats.

It covered up the water stain but now I can't get the primer to cover! It keeps leaking through the ceiling paint. :(

Gymschu 06-20-2013 12:46 PM

That's not unusual. You have a "shiner". It is not uncommon to have a shiny spot for a few days where the oil/shellac based primer was used. I don't know why, I just know it happens. Give it a few days and it should be alright.

Jmayspaint 06-20-2013 01:53 PM

I'm trying to understand the whole problem. You said the ceiling had builders flat originally. Then you tried to cover the stain with ' ceiling white' but it still bled through. Hence the first pic where it looks like a white rectangle on a somewhat grey looking ceiling.
Going over the white rectangle with the primer stopped the stain from bleeding, but after finish painting you can still see the whiter rectangle?
I see a 'shiner' too, I think that is caused by the finish paint drying/curing much slower on the primed areas than on the more porous unprimed areas surrounding it. And yes, that part will go away.
Are you finish painting with the ceiling white you originally tried to cover the stain with? Or something else

KD PAINTING 06-20-2013 06:30 PM

Water stain on ceiling
That's right, you need to use an oil based cover stain on this one. If you use latex primer, the stain will come through.

Good Luck!

adgjqetuo 06-20-2013 11:06 PM

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I let it go and took a look at it 4-5 hours later and you are right it 95% disappeared!

I'm pretty confident when I do the entire ceiling now I should be OK.

Thanks for the help!!

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