In January, I had an exterior wood door installed. Recently, as the weather has warmed up, the door has begun sticking. Is this due to the rising temps and the door, or door frame is expanding? I was supposed to put a layer of polyurathane(sp?) on, but was waiting till it warmed up so I could take the door off and due it outside and prevent my home from being as cold as outside. How/Can I remedy this? Should I shave the door back and then add the layer of polyurathane? Should I wait till it's real hot and the door has stopped expanding and then shave back and coat? Thanks for the help.