Oil Varnished Silk Oil Varnished Polyamide Fabric Alkyd Varnished Glass Fabric Silicone Varnished Glass Fabric Polyester Resin Treated Fiberglass Tape 2830-P,Class B Polyester Resin Treated Fiberglass Tape 2840-W,Class F Polyester Resin Treated Fiberglass Tape 2850-W,Class H Silicone Varnished Glass Fabric Oil Varnished Silk is made from the silk, i.e., insulating silk, and then, in the process of dipping in the oily paint and drying. Alkyd Varnished Glass Fabric is prepared by impregnating the glass fibre cloth with oil-modified alkyed varnish and then baking the coated cloth.