The 1/3 1/3 1/3 ratio can also be applied in other finishes. It is quite common in custom finishes in fine furniture. World famous Sam Maloof has his own formula that can be bought in a can or made up. He tells formulas himself in his book for the world to use.
One version of his is 1/3 Linseed Oil, 1/3 Raw Tung Oil, 1/3 Urethane.
A finish version is 1/2 Linseed Oil, 1/2 Raw Tung Oil and bees wax. Heat slowly and add bees wax until the bees wax melts, add in bees wax until it has a heavy cream feel to it.
These are for the professional user, and the waxed is very dangerous to someone who just thinks he can do anything anyone else can. The flash point of LO, RTO and wax are low enough to be dangerous.
I mentioned these because they can be found in books and on the internet and are not secrets. However, I will say that these types of finishes are not intended for the kind of handling that pens take. Pens and furniture are two different animals and need different feed - and pens need a different finish than furniture in order to preserve its first finished beauty beyond a few weeks. Furniture does not go through the same kind of wear that a pen does.
