Rather a double mat is just two single mats stacked together two single mats with two different size windows stacked together so the window of the under mat appears as a band of color around the inside of the window of the over mat.
Cutting double mat board.
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Once the framer grasps what a double mat actually is the proper way to cut it seems clear.
A double mat never involves cutting through two thicknesses of mat board.
Mat board center pack of 25 8x10 white backing boards 4 ply thickness for pictures photos framing support great for diy projects art prints 4 2 out of 5 stars 40 14 99 45 59.