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For extreme hardening, particularly with papercraft or Pepakura models, coating with fiberglass resin is a common technique.

Applying a thin, transparent layer of silicone gel to paper increases its strength. Sprays: Clear sprays, such as polyurethane or , can be used to stiffen paper models. indurate

Mixing school glue with water and applying it to paper with a paintbrush increases stiffness. For greater rigidity, multiple sheets can be layered together with glue and dried under heavy books to prevent warping. For extreme hardening