Last year I built a cedar chest for my son and his wife. I used glued up cedar panels for the interior of the cedar chest and glued 1/4" oak plywood to exterior and dressed it up with oak corner and trim moldings. It was probably my best wood working finished product. They left, for Iraq (they are both in Army Reserves) shortly after receiving the cedar chest. When they arrived home a year later, they found the interior of the cedar chest oozing a very sticky substance around the entire top and from screw holes in the top cover holding down the padded seat. I can not determine if it is sap or somehow the poly urethane finish. It is very stick to the touch. The wood was supposed to have been kiln dried. I am at a total loss! I tried to wipe the ooze off with mineral spirits to no avail. Acetone seems to work, Any ideas what could have caused this or what it could be?