I do large batches (my chamber is 10" dia. well casing, 18" tall) and pull serious vacuum (commercial 6 CFM, deep cycle 2 stage vac. pump!) and pressurize to waaaaay too much

. But I overkill everything!
Fiebeng's Leather dye works great as well...... & for bone & horn, potassium permangenate powder (found in the water softener section of Sears), diluted in a little water does a beaut of a job on horn and bone...goes on purple, turns brown.
This works especially well on birdseye maple, then use a heat gun lightly over the wood. That's what they used to do on the curly and birdseye gunstocks of the high-end muzzle loaders....& they are a sight to behold!
The wood hardener is ok, but there's a couple heat activated polymers (Opticon is one, the other's made by LocTite) that do an outstanding job on makin' rotten wood HARD! More expensive tho...
Harry
PS Anybody tell me how to post pics on here, and I'll show you some of the stuff I've stabilized!