Is there anything to coat the inside of the eggs so that it stiffens and doesn't break so easily?
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It depends on how stiff you want the eggshell to become. A quick hardener would be quick dry nail polish. If you are doing a large quantity of eggs, a polyurethane or acrylic would work. Craft glue that dries waterproof can give a thicker layer to the interior that is also slightly flexible. General washable craft glue can also be used and can be washed out later.
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