Witch's Brew unmasked.
Dave Smith, Longview, WA
>Hi Bub,
I used the term Witch's Brew a long time ago on Badger Pond to refer to a finishing concoction that Chico(a.k.a. H.C. Sakman) recommended. I make a flippant remark about the finish being a special, secrete concoction that Chico let me in on, by calling it Witch's Brew. When Chico told me about it he said it was an old recipe that had been used by craftsmen for many years.
There is no set combination for the ingredients for Witch's Brew. I generally use equal parts of boiled linseed oil(BLO), gloss polyurethane and a thinner of choice. For lighter wood you can substitute tung oil for BLO. Some people use both oils and vary the proportions to suit them.
I have found that mineral spirits made me sick. And I avoid using it in my shop. I found a substitute called t.r.p.s. It is a strange name but it doesn't bother me like mineral spirits and works very well in a wiping finish. Gary Hern recommends real turpentine which he believes increases the chatoyants of the wood. Chico adds a little Japan dryer even though the polyurethane and BLO have properties that induce polymerizing.
My usual blends is:
1/3 BLO
1/3 Gloss polyurethane
1/6 trps
1/6 naphtha
A word of caution. Improper disposal of oily rags has caused more wood shop and home fires than I care to know about. Any rags must be disposed of properly to prevent a tragedy. I put my used rags out side on a concrete side walk until they are dry. You can tell because the rag will be stiff. Some people hang the on a line with close pins.
Dave Smith
Wondering what the original question was in Longview, WA.