Always keep the package closed until you are ready to use it. Once opened, keep the dough covered and barely damp. Phyllo dough becomes brittle when it dries, so keep it covered with plastic wrap or wax paper and a damp (not wet) towel at all times. If you use just a damp towel, the sheets may got soggy and stick together. Never keep phyllo uncovered for more than 1 minute at time.