using exterior paint to paint interior?

What are the disadvantages, problems, no-no's, or whatever.......regarding using an EXTERIOR water-based urethane acrylic paint, (Sears Weatherbeater Ultra) .......to paint a room interior?
I have the paint on hand, and it's the color I want, so seems like I could use it to paint wooden trim and paneling inside a room.
Thank you..... Lee Carkenord
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According to my paint supplier where I buy most of my paint (Glidden, Coronado), there are differences that you should be aware of, but not necessarily worry about. It depends on your application.
Interior paint is not very UV resistant; but it dries harder than exterior and is more scrubable, which is the way it was designed. Notice I said scrubable, not washable. Scrubbing allows crayon, handprints, etc., to be scrubbed off with cleaners. I think of washing as rinsing with my power washer with water and light cleaner. No stiff brushing or worse.
Exterior paint strikes the balance between UV resistance and washablility. You can wash you house from time to time for years to remove the grime and the paint will be completely fine. However, after the paint has been on the house for few years, try scrubbing off the bird poop and look what it does to the finish. Not too scrubable.
I use my left over interior paint all the time for exterior primer if it is a neutral color. I use exterior on the inside without problems if it is a house that has no children.
In my experience, just about all interior and exterior the paints perform the same no matter where they are used in the first year or so, but after that you can really start to tell the difference.
If you are painting a room for adults only (no handprints or scratches on the wall) you will be fine with the exterior.
Robert
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