I have a few leftover cans of Nippon wall paint from my previous paint job at home. Do you all know how long they can generally last? One looks diluted already (a layer of clear liquid at the top) and some are a bit hardened.

How long do you all normally keep them?

Thanks for any advice.

My uncle said normally can keep for 8 to 12 month after opened, the color become lightness & smell stinky.

Thanks. I think I need to throw away mine then. It's more than a year. Yes, very stinky!

If properly covered, can extend more than a year. It will be a bit dry up but just add some terpentine will do.