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I think the water is necessary to make the emulsion when you shake the mixture. The emulsion allows the oil to brush into the dry oil paint surface like polish. In practice it brushes in so well that there is barely anything there. The water moisture left in the paint is so minimal that I have never heard of it being a problem.
I never enjoyed using retouching varnish. It seemed to attract dust, sometimes be unpredictable in drying and give the painting a brittle texture. I was so glad to find an alternative.
Please do test it and tell me what you think.
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