Painting - How long does sealed paint last?

I have a few cans of "Sandscape" paint that I bought about 4 years ago. How long will sealed paint be good for?

All depends on where its been stored...if it was kept inside it should be fine. If it was left in a shed and went through several freeze/thaw cycles, its probably no good.

Oh, and were these full unopened cans? Or were they half empty?

The Pro's will be able to give more details, but basically open it, check the texture and smell it. A latex can go bad and smell spoiled or get cottage cheese type lumps in it.

Not sure about an oil base...

If Sandscape means it has texture in it and it's sat for 4 years it will need to be shaken however if these are not full unopened cans in good condition nobody will touch them.Partially full or damaged cans have a nasty habit of losing the lid in a shaker.That includes cans with a heavy build up on the rim.If you knew how many cans like that I've seen pop open....

GG is right and beyond what he said,if the cans have rust on them that's a red flag and there's a good chance you'll have issues.

Doubting this is oil based paint.Biggest issue if it was would be separation and reblending again best in a shaker.

I've opened partial cans that were 5+ yrs old and the paint was still fit to use and I've opened cans that were less than 1 yr old and had to discard them. Too many variables to say for sure. When it comes time to use it, open them a little early incase they've went bad - so you will have time to buy replacements.

If latex paint has been subjected to freezing temps for any lenght of time - it's toast.