[quote=charlescarlis]ditto on not using mat for this application. Mat is for building up bulk, which helps with strength, but uni-directional materials and cloth are the best here; much stronger per unit weight. From experience. I THINK ziper means to lay the 6 ounce cloth at a 45 degree bias across the long axis of the board. That technique is very common to prevent twisting/warp/flutter. Alternate directions with layers. Can't speak to using uni-directional materials in the same manner.[/quote]
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