I be leave this subject will never end.
Formula to remember 1:1:1. A drying oil, A resin of some type. A carrier fast or slow evaporation.
The Granddaddy of them all is the Brit Admiralty Spar Varnish formula from the days of sailing ships, comprising of Tung nut oil (this was swapped out in favor of Linseed oil because of cost), Copal Resin, Pure Turpentine.
Venice Turpentine is just boiled Larch tree sap, used by oil paint artists to improve the paint's body and spread ability. Good for history not so good for keeping the damp out.
A bit of self advertisement take a look at the F,A,Q, section Damascuses traditional oil stock finish for the history and the how to.

The only lessons in my life I truly did learn from where the ones I paid for!