You can fully cure with a heat gun. It will last. I would blow on both sides of the canvas.
To make sure you fully cure. Heat guns are hit and miss when using to cure plastisol. The last area of the ink to cure is the area farthest away from the heat blast-the ink that's actually touching the canvas. Left uncured, the ink could soak into your canvas leaving the edges of your print muddy.Thanks,
but why on both sides?