By all means, use the csm in addition to the biax. If you plan to use polyester, you need the csm for waterproofing anyway. I would wet out my csm and then immediately lay a layer of 17 oz biax on top, roll it out, then repeat laying the csm then biax going in another direction. CSM is great for building thickness. Thats not a real heavy mat like I was imagining. Just make your design with nice big radii to make glassing easier.
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81 V20 1996 200 Ocean Pro
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