To the right is a photo of the 8 harness satin weave style 3783 16 oz/sq yd fiberglass cloth that has a thread count of 54 x 48 ends/inch and uses the yarn ECG 37 1/0 in the warp and fill. All photos have different magnifications though one can infer the scale by a simple consideration of the thread count. Buy your size of roll of 16 ounce 8 harness satin weave fiberglass cloth style 3783 with the 627 silane finish, with the 497A silane finish, JPS made 3783 with the S977 finish,
Here's a little closer look at the 16 oz/sq 8 harness satin weave style 3783. Photo taken with the side showing to obviate the orientation.