Than you, Michael, for you advice, but I think I will try the board as is without any modification, because any alteration might not be satisfactory.
Really, I always tone down the canvas when I paint "alla prima", but I thought that when you use an underpainting and transparent glazes you want the white of the support to shine through the various layers of color. The Impressionists who did not paint with glazes used a white canvas primed with flake white. However the Great Masters who painted with glazes, used to tone their canvas. So that's why it's a little confusing for me.
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Tito Champena
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