Article: Use equal parts water and equal parts school glue to create a watered down mixture. Line a small bowl with plastic wrap or wax paper to protect the surface of the bowl and mix your solution with a disposable utensil. Mix as much solution as you think you'll need depending on the size and amount of sand dollar shells you have. Like a baking sheet or large plate with wax paper and lay your dry shells on it. Place your shells with the rounded side facing up. Make sure to space your shells an inch or so apart. Using wax paper allows for an easy clean up. Use a soft paintbrush to paint the rounded top side of your shells first. Try to avoid touching the shell with your fingers, this can leave smudges in the glue. Allow the glue to completely dry before flipping the shells over and painting the underside.  Painting your shells with this glue mixture will harden the shells, which will help them last longer. Maintain a clean work area to ensure dirt and debris don’t get stuck to the sand dollars. This method will create a dull natural finish for your sand dollars.
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Prepare your solution. Lay your shells on wax paper. Paint glue on your sand dollar.