One thing that you can do to keep the can from drying out is not even remove the lid, but rather drill 2 holes in the lid about 1/4". Then milk the paint out into a bowl that you can work out of, and when you are done just screw 1/4" bolts back into the lid...I do like to use a bolt head though. I have reused it upto 2 years with this aproach.
