→Update 4: epoxy + laser cutting into layers
Polyepoxides (epoxy) act as a tight barrier. Once dry, it becomes rigid and retains its shape, which makes it possible to use it to reinforce the containers which are coated with it. In addition, when the reaction mixture polymerizes, it reacts chemically with many organic or inorganic materials. This reaction makes it a glue with a good tensile factor in the presence of many materials (wood, glass, porcelain, metal, etc.).
Epoxy glue is made up of two toxic elements: the resin and the hardener. When the mixture is perfectly dosed, polymerization makes the cured material relatively stable and neutral. Risks associated with handling epoxy without protection according to Wikipedia (https://en.wikipedia.org/wiki/Epoxy):