I know that there r a few ways to work custom fiberglass items. People use glass cloth, mat & some use fleece to do boxes and pods & such. Has anyone heard of using burlap? i've been gathering material to do a custom speaker box, rack and panels in my hatch and saw some burlap at the fabric store. i'm thinking it would work really well, it's very strong, flexible when wet & thick. A couple layers and u would have a very strong box. Tell me what u think or what you've seen.