I have an Anderson overhead garage door, 18 years old. The sections
are built on a wood frame, with an insulation core, and what looks
like masonite as the surface. The outside surface is texturted, I
guess it is supposed to look like wood grain.

I am getting some water damage (rot) at the bottom of the door (in the
masonite), where snow and rain splash have made some water damage. I'd
like to repair it before it gets too bad. I have considered digging
out the rotten material and using some sort of filler, perhaps an
epoxy. Another possibility is Liquid Wood, which I have used
successfully on a previous house, but I don't know if it would work as
well on a compressed wood material like masonite.

Any suggestions?

TIA,

Terry