How do you pour paint from a can into a tray without making a mess?
You can buy a pouring spout that fits on a gallon can at Home Depot for under $2.
The spout, or there is a flexible thing that attaches to the inside rim of the can that is very easy to wash. Shouldn't be more than a buck or two.
I found that a disposable cup of some sort, dipped into the bucket, and then poured into a paint tray worked, until I got the paint in the can down to a level that I could easily pour.
Gale form Woodbridge, Ca.