Choosing the stock
Scrim vinyl is the default — a PVC face over a woven polyester scrim that carries the load, available in a range of weights. Lighter weights suit short interior hangs; heavier ones take outdoor exposure and repeated installs. Blockout stock adds an opaque layer between two printable white faces, which is what makes a genuine double-sided banner possible. Without it the image on the back reads through the front as a ghost, and that is the most common reason a double-sided job gets reprinted. PVC-coated mesh is a perforated stock for anything hanging in wind, and the holes are the point rather than a way of saving weight: a solid banner on a fence or a building face is a sail, and mesh lets air through so the load drops instead of tearing out the grommets or bending the structure.