Any suggestions on proper ways to store paint for long-term use?
How long term? Is it opened product? Store in a dry location that does not freeze in the winter and will not cook in the summer
To add to that, If its going to sit for a long time(maybe a year or so) shake it good once a month. That will help keep it from separating.
If in a metal container, make sure the lid is on tight and store it upside down. That's what I do and they seem to last a lot longer.
Why upside down?
Because most lids have minute air leaks from opening the can too many times. This dries out the paint prematurely. The paint seals the small air holes without spilling out.
Either way, the shelf life of a quality water base paint is about three years before it goes bad. After that you have to dispose of it.
Well I have some paint that needs to get gone then.
Seems I always buy small amounts for touch ups and then never use it.