Systems and methods of forming a fluid barrier

A panel comprising:

• a core layer comprising an arrangement of multi-sided hollow cells in a honeycomb structure, the core layer comprising a first side and a second side;
• a first intermediate composite layer on the first side of the core layer, wherein the first intermediate composite layer comprises a fiber reinforced polymer;
• a second intermediate composite layer on the second side of the core layer, wherein the second intermediate composite layer comprises a fiber reinforced polymer;
• a fluid barrier on the first intermediate composite layer, the fluid barrier comprising:
• a primer coating layer formed directly on the first intermediate composite layer;
• and
• a first topcoat layer on the primer coating layer;
• and
• a second topcoat layer on the second intermediate composite layer,
• wherein the first intermediate composite layer comprises microfeatures, wherein the primer coating layer is disposed within the microfeatures.

A panel comprising:

• a core layer comprising an arrangement of multi-sided hollow cells in a honeycomb structure, the core layer comprising a first side and a second side;
• a first intermediate composite layer on the first side of the core layer, wherein the first intermediate composite layer comprises a fiber reinforced polymer;
• a second intermediate composite layer on the second side of the core layer, wherein the second intermediate composite layer comprises a fiber reinforced polymer;
• a fluid barrier on the first intermediate composite layer, the fluid barrier comprising:
• a primer coating layer formed directly on the first intermediate composite layer;
• and
• a first topcoat layer on the primer coating layer;
• and
• a second topcoat layer on the second intermediate composite layer,
• wherein the first intermediate composite layer comprises nanofeatures, wherein the primer coating layer is disposed within the nanofeatures.