HOLD ON!!!
I'VE GIVEN SOME BAD ADVICE HERE.
DON'T USE EXTERIOR PAINTS INDOORS!
I just Googled the phrase "exterior paints indoors" and found that every web site I found agreed with Zampa that you shouldn't use it indoors.
There's this Q&A on the PaintStore web site's "Ask Dr. Paint Q&A's:
Question I have some white exterior paint that I want to use indoors. Is this a problem? I can understand using interior paints outside is not a good idea, but what are the potential problems with using an exterior paint indoors?
Answer Don't use exterior paints indoors for two reasons:
1) An exterior paint is made to be flexible enough to withstand the movement the occurs in substrates due to changes in temperature and humidity. Because the flexibility means a softer paint film, exterior paints will not withstand the physical abuse, washing and scrubbing that interior paints are designed to handle.
2) Most exterior paints contain chemicals to inhibit the growth of mildew on the paint film. The amount of mildewcide in an exterior paint usually exceeds the limits allowable for indoor use.
And there is this excerpt from a Paint Quality Institute newsletter Q&A:
http://www.paintquality.com/contractor/newsletters/contNL1105.html
Q: I know not to use interior paints outside for durability reasons, but what about using exterior paints indoors – is there any problem with that?
A: This question comes up from time to time, mainly from do-it-yourselfers, but it can be helpful for contractors, as well. We recommend against using exterior paint indoors. There can be lingering odor from the paint that can be quite disagreeable. An exterior paint may not tend to flow out as well as the interior counterpart, so brush and roller marks can be a problem. Also, the paint may take longer to dry and cure, so surfaces may stick to themselves (“block”), such as a painted door sticking to the painted door jamb.
Sorry for the bad advice. I knew that exterior paints were softer, but it didn't occur to me that the amount of mildewcides in them would be HIGHER than bathroom paints, and therefore not be allowed indoors!
Also, I can't really understand why an exterior paint wouldn't flow and level as well indoors, nor do I see why an exterior paint would take longer to dry indoors, so there must be more of a difference between interior and exterior paints than I was aware of.
Anyhow, as soon as I got on my computer tonight and did that Google check, I figured I should come right back in here and correct myself.
Both web sites are obviously highly reliable. The Paint Store web site is owned by an association of painting and wall covering contractors.
http://www.paintstore.com
I am a little puzzled by the fact that both sites seem to be citing different reasons for not using exterior paints indoors, although it's clear both recommend against it.