Basted, not Wasted: When I need a small amount of paint or finish from a can, I don’t pour it into another container.
Instead, I use an inexpensive turkey baster to draw the liquid out of the can and dispense it into the smaller container.
I get just the amount I need, and I don’t have to wipe the rim of the can clean to get a good lid seal. Afterwards, I wash out the baster for its next use.