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Sandy,
You CAN use only acrylic primer on your raw linen. Then you must prime it and sand it and prime again. When it is dry you must stretch it a little.
The idea of rabbit skin glue is to isolate the fibres from being impregnated with oils, whitch will cause it to stiffen and eventually crack.
Another advantage is that you can allways stretch the canvas if there should be a pressuremark, you just moist the backside and the linen will stretch again.
But I agree with Michele that if you are in doubt, or are too wealthy, you should buy a ready made canvas.
I usualy prepare 10, or so, canvasses at a time.
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