Pour the glue into a medium bowl.
Add in baking soda.
Add your spiders. You can also add glitter, natural food coloring, or other little trinkets like googly eyes at this time.
Add the contact lens solution and stir slowly. The mixture should begin to harden. If the mix gets slimy, add more solution.
Continue mixing slowly until a ball of slime forms.
Seal in an airtight container when finished.