Im quoting someone else, but i dont remember who.
60/40 is the ratio. 60% boiled linseed oil, 40%mineral spirits, and its a 50 second dunk as i recall (thats where you might of got the 50 from). I Dont recall how he arrived at that, but he musta tested it and thats what yielded the best drying time with good penetration. Someone correct me if Im wrong.
As stated above, cedar does not need the treatment. but birch & poplar definitely do.
Happy Holidays !
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