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Linda,
I have not used walnut oil, but have been reading about it and some of the other Forum members love it. I do not know how it stands up over time. I would worry though about using such thick glazing techniques that it may yellow and become brittle. I am sure Marvin could answer this. It sounds like you want an impasto that is transparent. There may be such a medium specifically for this purpose, have you checked some of the catalogues?
Everything I have read about glazing recommends thin layers. Sorry.
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