I got the fiberglass directly from KBRS when I waterproofed my shower with their system. I liked their fabric (don't know what brand they actually sell, they won't tell) but this fabric seems to be even better. Not much better than I would say you should only use Laticrete, but it is a very homogeneous product and works very well in combination with RedGard. When I create a barrier with fiberglass fabric and RedGard I get a real sense of strength and impermeability. Just not so much with RedGard. The attached photo shows my application where I covered the seams in the Wonderboard and all the screw holes. After that I covered 100% of the Wonderboards with RedGard alone.
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