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Susan,
Sorry you are having this problem! It is a pain. I have had similar problems when the canvas is the end of the roll from the manufacturer, and it has "oily" spots, some covering the entire canvas. This causes the paint applied to dry extremely slowly. Also, the paint dries unevenly on the canvas, and can even dry into paint rings. If you are having this problem with both mediums, it might be the canvas and not the medium.
Unfortunately, as Karin stated, I don't think you can safely remove the Liquin/paint without causing bigger problem to occur. I have found that spraying with retouch varnish can speed up drying time. I don't think there would be a problem with the Liquin already applied. (...althought you might want to wait to see if there is disagreement with this before trying it...).
Peggy
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