Fiberglass mat with Epoxy resin?

[shine]

Biaxial glass (with matt) will vary in the amount of binder used depending on the manufacturer. Just be sure the biaxial cloth you buy (if it includes matt) will wet out with epoxy. We use/sell epoxy exclusively and the 1708 we sell will wet out almost transparent, its held together with stitching, no (almost no) binder.

With epoxy laminates, the only reason to use matt tis to build thickness quickly. Matt is not needed for inter-laminate bonding as it is with polyester. Unless I trying to build thickness, i use combination of biax without mat for all my bonding. For instance, 2 layers 12 oz biax is much stronger than 1 layer of 1708, but it uses less epoxy (less overall weight)

I have two different biax for the rebuild of my 23SC transom. you can see the difference in the two. Here are two layers of the good (more stitching, less binder) 1708 overlapping a PVC pipe along the keel.



and here is a layer of 1810 with a lot of binder in it. it is a pain to wet out and I would only use it on simple surfaces and curves, but it does build thickness quickly