We have what appears to be the original front door in our 1802 Colonial. The wood has cracked in a few places so we'd like to repair it before winter hits. Recently on TOH - Bedford project they did a similar repair using an epoxy. I can't find what kind of epoxy. They said it was flexible which most of the products I see do not mention.

Does anyone know what this epoxy product is? Or is there some other repair material that might work the same or better?