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This happened with Fredrix Rix (single primed oil) canvas a number of years ago. I have since talked with others who had the problem with different brands of canvas. The canvas has a visible "hardness" to it. A slick quality. The paint does not adhere well initially, and then dries too slowly, and unevenly.
It is not necessary to toss out an "end run" canvas, I just rub it down with mineral spirits, removing the excess oil and making it more receptive to the paint.
Peggy
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