Some tips from the web about making your carved pumpkin last longer!
To keep a pumpkin from drying out, cover it with a damp towel when it is not on display. To make your pumpkin last longer, wait for half an hour after you finish carving, then rub the cut areas and inside with a dry cloth and apply a protective coating such as petroleum jelly, clear furniture wax, or vegetable oil painted on with a brush. Some expert pumpkin carvers use several coats of lacquer or hair spray, which gives it a nice glossy finish. Others say that sprinkling a light coating of cinnamon inside will help keep it fresh, AND make it smell oh-so-nice when it's lit!