Some long time ago, on some forum, I read of a product that
resolidifies rotten, termite-eaten/powderpost beetle-eaten or
otherwise weakened or defected wood. Can someone direct me to this
product, if there is such, or a remedy for severely defected wood?
Removing part of the defects is an option, but in some places, glueing
new wood strips isn't an option, to restore the integrity of these
areas.

The specific problem is, regarding upholstery, the mangled, softened
wood along the decorative nail paths on an antique chair. There are
numerous nail holes in the wood, from having been reupholstered
several times before, and much of the wood is "chewed" to "softness"
and/or seems to be in a soft dry-rotted state. The wood is no longer
stable enough to hold new nails. I've had success with bolstering
similar wood defects, as this, but this case is much more severe.

I've thought about epoxy glue, but I have no experience, at all, with
epoxy glue, so I don't know if epoxy would be brittle and chip out,
when nailed into, especially along these narrow nail paths.

Thanks for any help.
Sonny