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annie68164 03-21-2010 05:53 PM

Do stain-blocking primers really work?
Hi I am getting ready to texture an old water-stained plaster ceiling with joint compound. I did some patching already and brown stains came through. I can see a few more brown stains on the ceiling, some big, some small. The house is circa 1920s, I know the roof does not leak now but obviously did in the past. I just would like to know if anyone doing a project like this had good results from a stain-blocking primer. If so what brand did you use? Did you apply it directly to ceiling or waited until you were done texturing it? Did 2 coats suffice? I just don't want to do the whole project only to have those brown stains come through. Thanks for any help! Annie

firehawkmph 03-21-2010 07:31 PM

I have always used a shellac-based primer for water stains. It seems to work well. It dries quick, but smells like alcohol, so do it on a day when you can crack some windows. I would prime the ceiling before texturing. Others may have different opinions.
Mike Hawkins:)

chrisn 03-22-2010 02:57 AM

As firehawk said prime first with Bin, apply texture, then prime with any good primer,then apply finish paint

annie68164 03-22-2010 07:20 AM

I have used shellac before with good results. I know what you mean about the smell. If I remember right you have to stir it constantly too :) That's what I'll use then. Thanks everyone.

jlhaslip 03-22-2010 10:28 AM

Google zinsser primers

annie68164 03-30-2010 08:10 AM

Thanks for the help everyone! I finished the project and posted pics on my profile. It turned out great, lots of work, that is for sure!

mazzonetv 03-30-2010 01:56 PM

just used Zinsser's Smart Prime for the first time to cover water stains and was happy with the results - of course six months down the line I'll know "how happy". Had a situation where I couldn't use the alcohol because of the smell so figured I would try the smart prime - zinsser claims it works great on water stains with all the benefits of a water based product.... The only place they don't suggest using it is to cover ODORS (typically from smoke damage) - as the pros here know only the Bin will seal in the odor.

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