If you have to use a natural drying oil, at least use a good one. Tung oil is superior to linseed in every respect. Especially in the moisture resistance dept. The 50% polymerized formulation is better than the regular oil. Here is one source:
https://www.leevalley.com/en-ca/shop/tools/supplies/finishing/finishes/20050-polymerized-tung-oil Another:
http://sutherlandwelles.com/instructions/PTO/GunStocks-PTO.pdf RAN
