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Peter,
Fredrix makes an acrylic primed poly canvas called Red Lion Polyflax. It has a uniform weave and won't expand or contract from humidity.
I've used it, but I've always added one or two more coats of acrylic gesso applied with a knife to fill the weave.
I'm back to using linen again.
Tom,
I apply a coat or two of either Gamblin's PVA size or a good quality acrylic gloss medium to the BACK of a new linen canvas and then stretch it even tighter after it is dry.
I staple a piece of foam core board on the back of the canvas, covering the entire canvas. My linen canvases no longer move with the humidity.
Bill
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