Hot Oil Treatment

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If you’ve seen my noggin, you know this post won’t be about hair care.  Over the weekend, I finished the dry-stage carving of an ale bowl I had roughed out a couple months ago.  I thought it might be a good opportunity to briefly discuss my oiling procedure.

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The most important factor in finishing is the quality of the final cuts.  A properly sharpened edge will leave a cleanly cut, almost burnished, surface behind.

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Once the carving is done, I pour some flax seed (linseed) oil into the bowl, then dip my fingers right in and slather oil all over the bowl.

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I’ve explored many rabbit holes regarding oil choice and all of that, and I know it is a subject with a depth and breadth beyond this post.  One thing these natural oils have in common is a long curing time — potentially months.  Time to turn up the heat.

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I have found that heat drastically reduces the drying time of these oils.  In the heat of summer, I place a newly oiled bowl in direct sunlight.  We were treated to a beautifully sunny weekend but the sunlight is not intense enough now.

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At other times of year, I’ll place a bowl in front of the fireplace or in a little light bulb kiln that I made for drying chair rungs years ago and I still use it for that occasionally.  Based on a design by Jennie Alexander, It is simply a plywood box lined with foil-faced insulation board.  There’s a sheet metal baffle above two porcelain fixtures.  It is essentially an Easy-bake oven and the temperature can be controlled by varying the wattage of the bulbs.  My wife even uses it for making yogurt.  With two forty watt bulbs, it maintains a temperature of about 110 degrees Fahrenheit.

After a couple hours, I rub off or rub in any excess surface oil.  Then, after a day or so in the box, I’ll begin with other coats, moving on to a blend of flax oil and beeswax.

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11 Responses to Hot Oil Treatment

  1. Walter Joseph Kovacs says:

    Is it a kestrel knife I can see on the first and last picture? Beautiful ale bowl btw.

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  2. Scott Kinsey says:

    Homemade yogurt??? Boy, did you ever marry well!

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  3. Paul Anderson says:

    I like that picture of your drier. My incubator box has been working quite well for oiling my bowls in the winter also. It is a plywood box about 12″ by 30″ and 12″ deep. I use a 60 watt bulb which keeps it around 100 to 110 degrees. It’s not really a drier, one hole on each end for a little convection action. A window on the top lid to see what is going on inside. No chickens have been hatching in there yet.

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  4. John Reed says:

    So David, do you buy your Flax seed oil at the health food store or raw linseed oil at the local paint store, are they exactly the same? John

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    • Dave Fisher says:

      Well, they are not exactly the same, John. The subject is deeper than this, but I’ll summarize. It is all oil from flax seeds, but to be labeled flax seed, it is a food-grade product — so usually sold in health food stores or well-stocked grocery stores. Flax seed oil is cold pressed by purely mechanical means. It is usually light in color.

      “Raw Linseed oil”, like flax seed oil, is free of chemical drying agents but is processed differently than flax seed oil. In addition to cold pressing, they extract additional oil from the pressed mash by adding chemical solvents like hexane and then completely removing the solvent afterwards through evaporation or distillation. So “Raw linseed oil” sold at the hardware store tends to be yellower and darker — but should still be free of any toxins.

      The stuff labeled “boiled linseed oil” at the hardware store is not truly boiled — a process that goes back a long way. Rather, chemical drying agents — heavy metals — have been added to speed curing time. So there are toxins in the final product that you expose yourself to when applying it.

      Yet another distinction, even among flax and/or raw oils is whether it has undergone polymerization or pre-oxidation. The stuff from health food stores has undergone neither. I have purchased larger quantities from https://www.soapgoods.com/Flaxseed-Oil-p-580.html . A couple varieties are here http://solventfreepaint.com/cleaned_linseed_oil.htm including truly boiled. Tried and True products http://www.triedandtruewoodfinish.com/ are all based on polymerized oil. There are differences, but they will all work in the end.

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      • John Reed says:

        David, thank you much for that info., I do a lot of spoons and am always on the lookout for a finish that will offer a little more sheen. I’ve been happy using Wheelers Wood Oil which is a walnut/tongue oil mix, but it seems it is no longer being produce. I think I will give Tried and True products a try or maybe Mahoneys. Again thanks for the info. John

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  5. John Reed says:

    Your bowl work is just astounding to me! I hope to someday see and touch one of your bowls in person, the carved finish you acquire is hard for me to fathom. Love your blog, please keep up the great work! Thank’s for all the info you share. John

    Liked by 1 person

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