Hey Dave, I've used uni-axials and biaxial cloth for paddle blades. I wouldn't use them on a the outside of a hull unless you'll be vacuum bagging or painting the whole thing.

Axial cloth has "axes" or bundles of fibers that go in different directions, not unlike woven cloth. But, as you know, where woven cloth warp/weft fibers bend up and over each other, each axis in axial cloth is separate and on top of one another. So, instead of weakening the cloth with the fibers bending around each other, the fibers all run "perfectly" straight. However, to bind the axes together, these fabrics are stitched together, with polypropylene or nylon, and this material doesn't wet out and disappear like the glass does. If you're laying it inside a mold (vacuum-bagging or hand-laying) then you'll have a smooth exterior surface that will be pretty nice. I sure wouldn't want to try putting it outside a wooden hull. You could never bright finish it and have it look good, and even if you were painting it, you'd have a hard time sanding all the stitching so it looks good under paint.

So...how they compare: stronger, slightly more cost, a bit harder to wet out, and stitching remains visible.

Shawn

: I am looking at using a bi or triaxial cloth for my boat... I'm wondering how
: they compare to regular FG cloth...

: any info would help

: Thanks

: DAVE