<ul data-eligibleForWebStory="true">Making corrugated cardboard stronger and waterproof is possible through various techniques.Gluing multiple panels together and alternating the corrugation by 90 degrees increases sturdiness.Using wheat paste as adhesive and folding edges over help protect against damage.Integrating wood supports and applying wheat paste to external surfaces also enhance durability.Creating a custom outside layer through papier-mâché skills allows for sanding and painting for different uses like furniture.To waterproof corrugated cardboard, shellac can be used in a mixture with IPA, shellac flakes, and beeswax.An alternative waterproof coating can be made using hot glue sticks, paraffine wax or beeswax, and mineral oil.These methods require time and material investment, but using cardboard is cost-effective.The waterproofed cardboard can be used for projects like DIY campers, providing a lightweight and waterproof option.The techniques shared by [NightHawkInLight] have practical applications and can be a fun project.These methods can be a great way to enhance the durability and functionality of corrugated cardboard for various uses.