Hi There! I Recently Made a Bowl Out of Buttons & Glue by Gluing the Buttons on an Inflated Balloon Then Painted 4 Coats of Mod Podge Over It, Letting It Dry Between Coats. Once It Was Completely Dry I Popped the Balloon & Found That the Bowl Is Still Soft & Flexible. I Don't Have Much Money So I Am Looking for a Homemade Substance I Could Coat the Bowl with That Is Clear & Will Sturdy It Up a Bit, Maybe Resin or Plastic-Like or Anything That Dries Clear & Hardens. Does Anyone Have Any Suggestions? Thank You for Your Consideration.