I had heard somwhere, maybe it was on a distillery tour somewhere, that the high alcohol content will break down synthetic corks, and they should be only used for wine. That was the rationalle given for using real cork by whoever told me that. I took it with a grain of salt and have not been able to confim the statement, but I have had high alcohol spirits with a synthetic cork no problem.
I wish I could remember who told me that.



