A common problem with paint cans is the build up of paint in the lid groove. This can cause spills outside the can and the inability to close the can properly. To reduce this issue, take a 6 penny nail and puncture the can in the groove. These holes allow the paint to drain back into the can. They don’t affect the seal on the can as they are below where the lid friction fits when reinstalled.
Another suggestion is to use a pour spout. This is a flexible plastic piece that fits in the inner groove of the can and form a spout to pour from without drips running down the side of the can. I’ve used these with good success, though there is till some dripping to watch for. It is undoubtedly better than just pouring from the can lip itself. They are fairly inexpensive and reusable.
Picture Source: Amazon.com