Unless you have a leak.

"Prometheus" wrote in message
...
On Mon, 18 Dec 2006 13:28:11 GMT, "Ron Magen"
wrote:

Another trick I typically use in conjunction is . . . storing the
partially
filled cans upside down. That way if any 'skin' does form, it will be on
the
bottom of the contents and the usable portion can be easily decanted.

That's a good one- I never thought of it, but it sure makes sense.