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Clive:
In the past, I have used pure polymer medium to do this. I sand the board down with a very rough paper. I adhere the linen to the board by putting a coat of medium on the surface of the board, laying the linen over it and the coating the linen on the front side - it gets completely permeated with the medium. I roll it out with a roller and let it dry. I wrap my canvas around the board using the same technique and leaving plenty of canvas on the back side - again soaking it all in the polymer medium and rolling it down. After all is dry, I gesso it with five coats of good quality gesso - front, back and sides. This pretty completely seals in the fabric and makes a nice surface to paint on.
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