Zinsser 123 primer on bathroom ceiling?

You can leave it as is if desired. Many painting pros will use a wall primer on ceilings as a finish paint (e.g. Sherwin Williams Master Hide). If the Zinser is the shellac based is is a very durable product that dries very hard. It usually will require a couple of coats and give a nice slightly off white color. Coating on top of this with a latex can be a problem in a bathroom if the ceiling is low (even with good vent fans) due to the moist heat causing the paint to alligator on that hard shellac surface. On a seperate note this paint works well (actually the only solution) if you are attempting to paint a popcorn ceiling that wasn't properly prepped and starts to peel off when attempting to paint with latex paint due to the water in the latex paint dissolving/reacting with the existing latex, etc. The shellac based primer is in an alcohol medium and wont affect/react with the existing latex.

Rebuttal:

Contrary to what the answerer below says, Zinser still makes a shellac based primer which is in an alcohol medium. (read the friggin can!) This is used extensively in restoration work and comes in quantities as large as 50 gal. drums. It is used when sealing of odors is needed. (e.g. fire restoration, pet urine smells,etc) The 123 is indeed a latex paint. The BIN is the shellac base.

Generally the only significant difference between a primer and a gloss or semi-gloss is the amount of pigment and (for exterior) the amount of light stabilizers. I would certainly apply a second coat of something. Because of the often humid conditions in a bathroom you should use a gloss or maybe a semigloss. Perhaps you didn't stir it ? Otherwise I wonder why it would not be fairly flat. If you find it hard enough (primers often do NOT have scrub resistance) then it will probably be ok. I don't know 123, not having worked with it in some years, but I just question whether it really does dry "like a semigloss".

- refers to tds -

123 has a listed gloss of 23% -- that is NOT semi-gloss. (123+ has a gloss of "5.0" which is pathetic - I'm not sure what it means since gloss SHOULD be measured in % ). My recommendation? Wait about 10 days and see what its scrub resistance really is. The density of the 123 is slightly lower than 123+, so 123+ probably has even lower gloss than 123...IDK

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The deciding factor is probably how well it tolerates high humidity conditions. Some latexes soften and swell slightly, and of course none are as good as a top-of-the-line oil based top coat. Next time I paint my bathroom ceiling I will definitely use a paint that claims it is mold mildew resistant (as 123 does). So that is a good thing. (and to be honest, the hassles of using an oil for a low maintenance area like that ain't worth it.

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Rustoleum claims 2000 cycles scrub resistance. If that is the real industry test (as opposed to one designed to give great results), that is pretty good.

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Unless you used a really really old can, this is a latex based product, not a shellac, LOL.

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RE:

Zinsser 123 primer on bathroom ceiling?

I used Zinsser 123 primer on my bathroom ceiling. It covered very well and I wonder if I really need to use a semigloss paint over it? The primer dried like a semigloss.

Zinsser 123

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