I have just finished sanding and staining the interior of an exterior
door. Should I use interior or exterior polyeurethane on it? I'd
prefer to use the interior variety because I happen to have it, but I'm
not sure if I should use that or the exterior version, presumably since
this is an exterior door and even the inside of the door will be
subject to more hot/cold swings than an interior door would. Other
than that I can't think of any compelling reason to use the exterior
variety.