I saw this after I suggested fiberglass rope. The fiberglass rope will be stronger, but this is simply brilliant. I wish I'd thought of it. How silly to overlook such and obvious fiberglass source. It might be lower quality glass, or have other materials mingled in, but for filling space, and larger fillets, wow. I like it! I wish I had time to build various test panels and research the material a bit. It may be better than I think it is, and even at that it should be more than good enough.

> He was building a sailboat and just used the regular pink
> Owens Corning fiberglass insulation. He'd just pull off a chunk, stuff
> it into a void, and then saturate it with epoxy.