I've got a bunch of different paint from interior & exterior projects. They are usually 1 gallon cans with a quart or 1/2 gallon of paint. What's the best way to store them to keep the paint fresh so I can use it in months / years? later to touch up things? I've been putting them into the clear plastic round containers we might get for take out soup, etc. Trying to minimze the amount of air that's in the container - using different size containers depending on how much paint there is. For 1 smaller amount of paint, I put it in a ziplock freezer bag and squeezed out the air. Went to use it today and it was pretty hard. do zip locks usually work? the clear soup containters with snap on lids? Something else? Oh, have you ever heard of this? 2 year old paint can - enough paint that I left it in the can. The can had 2 rust holes through it?! Went to mix / shake it and saw the paint / liquid coming out! Never had that issue before. I know to keep the containers dry / clean / not wet environment / stored with all the other paints.

I'm on a birdhouse building campaign using scraps of OSB siding. In past experiences, it appears the sawed edges gradually delaminate in time/weather, even when painted. What would be a good product to seal the porosity of them prior to painting?