Dig out the really soft stuff. Allow it to dry completely. Treat with
Epoxy. This will turn the sponge to pertrified wood. Fill with Bondo.
Sand, prime and paint.
The only Epoxy product I have worked wit is West Systems. I am sure thaere
are many similar products.
If you can actually cut out all the soft stuff and get to sound wood, you
might be able to skip the Epoxy part and just use Bondo.
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