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I have several buckets of four-year old latex paint leftover from finishing our basement. Many are still in unopened original containers, in particular, our primary wall paint.

I opened one to use for wall patching and found it to be completely separated. This bucket was also in the garage and was subjected to freezing temperatures.

With just a little bit of stirring it seems to be back to life, but I just want to be sure that I won't have any adverse affects using it to patch several chips and scuffs around the house.

How long is the shelf life for latex paint?

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From what I have read it varies with the quality of the paint and the storage conditions,but 3-5 years is reasonable for unopened cans. Most of the evidence seems anecdotal. There always seems to be a case of someone using something 20 years old that they got for free and it lasted 30 years. There doesn't seem to be hard evidence from manufacturers saying that you will decrease service life by X number of years if stored for X number of months.I would do a test sample on something similar to your planned use, wood trim,drywall etc. Give it a day or so to see how the color match and texture looks. If it looks OK you have nothing to loose. If you buy new paint you will probable want to redo the whole wall so it will blend in. If the old paint doesn't match you'll have to redo the wall anyway

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3-5 years seems resonable. We've been working off a 5 gallon bucket of trim color here and it's still going strong at 6 years and about a gallon and a half that we've put in smaller tins. Just make sure you stir very well every time you use it. One of the problems you will have with old paint in gallons is that the metal can rust throwing nasty iron oxide flakes that ruin the color. Newer gallons are plastic except for the lid which can rust if it gets a pinhole in the coating. –  Fiasco Labs Sep 16 '12 at 23:27
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