Anti-fuel-leak barrier coating and methodology featuring cast layer structure

An anti-fuel-leak, plural-layer barrier coating applicable to the outside surface of the wall in a liquid-fuel container, said coating, in operative condition relative to such a surface, comprising

• a layer stack including plural, cooperating, barrier layers, each formed of a high-elastomeric material which reacts with a material-swelling behavior on contact with fuel of the type contained in the container, and, among said layers,
• at least one cast-formed layer, and
• at least one spray-formed,
• one of said two, at-least-one layers being an inner layer disposed directly against the mentioned container-wall surface, and the other layer being an outer layer disposed outwardly of the inner layer relative to the container wall surface.

An anti-fuel-leak, plural-layer barrier coating having an inner side applicable to the outside surface of the wall in a liquid-fuel container, and an outer side, said coating, in operative condition relative to such a surface, comprising

• cooperating, contact-adjacent layers, three in number, organized in at least one of the following manners, progressing from the inner side toward the outer side of the coating,
• (a) cast-formed, spray-formed, cast-formed,
• (b) spray-formed, spray-formed, cast-formed, and
• (c) cast-formed, spray-formed, spray-formed.