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If you buy a pre-gessoed canvas and you get the end of the roll, sometimes you can get a pooling of oiliness. It almost looks like big blotches of linseed oil have dripped on the canvas. It is impossible to see these oily areas until you have started the painting. They are visible because the paint dries extremely slowly and in a semi-oval pattern.
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Do you recall the brand of canvas? Did it happen more than once? I use the oil primed Claessens and so far (knock on linen) haven't had this happen on any of the rolls I've bought.