TECHNOLOGY FOCUS - METALLURGY - Preferred Component: The flexible web substrate comprises a first metallic layer having a first metallic surface defining the first major surface, where metallic layer is free of pinhole defects; and a second metallic layer having a second metallic surface defining the second major surface, where second metallic layer is free of pinhole defects.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The flexible web substrate comprises polymeric web substrate. The polymeric material comprises polyurethane, polycarbonate, polyvinyl, polyester, polyacrylate, styrene block copolymer, polyolefin, Kraton (RTM: styrene-butadiene-styrene rubber), and/or their copolymers or blends. It is in solution or suspension; and solidifying comprises drying the polymeric material. The polymeric material comprises thermosetting polymeric material; and solidifying comprises curing to cause crosslinking or partial crosslinking of the thermosetting polymeric material. The polymeric material comprises a molten thermoplastic polymeric material; and solidifying comprises cooling the molten thermoplastic polymeric material to below the solidification temperature or glass transition temperature of the thermoplastic polymeric material. The polymeric material has a viscosity of less than 1000 cP during coating. The method further comprises applying a polymeric planarization coating to form the major surface of one side or both sides of the flexible web substrate, before the step of coating polymeric material, where each major surface of the flexible web substrate formed by the polymeric planarization coating is a planarized surface; or planarizing clean surface(s) on the flexible web substrate, with a polymeric planarization coating, to form a planarized surface. The cleaning layer, after removal, is useable as a polymeric film material. Preferred Component: The flexible web further comprises a pressure sensitive adhesive layer adhered to the other side of the flexible web substrate; a second cleaning layer of solidified polymeric material coated onto, and in direct contact with, the second major surface; and an overcoat applied onto a side of the first cleaning layer opposite the flexible web substrate. The first and second cleaning layers capture greater than or equal to 25, preferably greater than or equal to 99.0% of the particles that were on the first and second major surfaces before being coated with the first and second cleaning layers, respectively. The overcoat comprises an adhesive layer.