I have a bay window with alot of trimwork on the exterior. This wood is in need of stripping and repainting which I plan on doing this week. My question is as follows: The trim has mitred corners that through the years have seperated and are no longer even. What I would like to do is fill in these corners with some type of wood filler and sand it smooth to hide these gaps. Does anybody know what would be a good filler to use for these gaps? I need something that will expand and contract without cracking. The gaps are 1/4" to 1/2" in size. I really don't want to replace the trim because I cannot match it. Thanx.