I have an old can of GLP Haddo's Delight from 2000 that I opened, never finished, then put it away. Can I add a few drops of distilled water to the tobacco then reseal the can? How long would it take for the whole can to reach the proper humidity. Keeping cigars humidified is so much easier. LOL
Greg Pease himself on the FAQ of his website has some words of wisdom on re-hydrating tobacco:
http://www.glpease.com/FAQ.html
"Q: What should I do about a tobacco that's too dry?
A: My method is to put the tobacco in a large, clean bowl, and cover the bowl with a damp towel. The towel should not touch the tobacco. Check the tobacco every couple hours, and when it reaches the moisture level you like, store it in an airtight container. Glass "bail top" jars work well, but be sure to clean them thoroughly. (See the next item on mold.)
Different tobaccos take up moisture at different rates. The denser leaf, like Virginias and some orientals, take up moisture very slowly. Spraying with water is dangerous, since it's difficult to control the overall moisture level of the tobacco. It's hard to evaluate the difference between damp leaf and soggy leaf. The method outlined above is pretty much foolproof."
Haddo's changes in amazing ways as it ages. I hope you salvage yours.