I am a member of a small 250+ yr old church. The front doors – I believe that they are pine – need not only refinishing but also need wood filler to fill gaps in primarily the trim due to warpage. I am looking for recommendations on what type of filler to use. Living in the mountains of VA, we can have pretty severe weather swings.

Any recommendations on a filler that will not only help fill the gaps but will also not shrink allowing moisture in?