Exterior door stile splitting.
I am trying to rejuvenate a wood panel exterior door. It's a side door that opens at ground level with a four inch high threshold. So, it gets a lot of exposure to rain and snow. I removed the door and trimmed the bottom edge with a router to clean it up for painting. I noticed the bottom endgrain of the hinge side stile has many splits. One split visible on the face of the stile is about three inches long. The stile is thick enough that I cannot widen the splits to pour in some wood glue or epoxy.
I would like to glue up the splits to stop the splits from growing. And, I would like to seal up the endgrain to prevent the door from absorbing more moisture.
Thanks in advance for any advice.