Mike, if it is primed it must have been sized too, so this should help on conservation matters. I wonder how hard it will be to stretch it properly though.
You might try, maybe, just to test how much of your oil is absorbed by the fibres.
As I said, my tutor set me on improving the way I managed the quantity of oil in successive layers: if I paint with less oil than the previous layer, the oil on top will be absorbed by the layer immediately under. If the canvas has already absorbed all the oil in the first layer you put down, then the next ones will just sink in. I like that luscious, rich aspect of oil paint, so priming is more suitable. With umprimed you get a more chalky quality, like Gwen John paintings.
This is all I know
Ilaria
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