The 1708 is primarily used with polyester resins. The mat sucks up so much resin that is makes for a good waterproofer but it is not as strong as the biax. The problem is that it sucks up so much resin.
When you use epoxy, it is a much better waterproofer ounce for ounce versus polyester so you do not need the mat. Straight 17 oz. biax will be sufficient but personally I am using 2 layers. I like overkill when it comes to my boat. The wood is your structure. The cloth seals the wood. I only go with 2 layers for the purpose of added protection against rubbing over time.
I like US Composites for epoxy and boat builder central for mat.
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81 V20 1996 200 Ocean Pro
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