Question: How do I make sure that the melamine doesn't swell up with moisture when making a concrete countertop mold?
Option 0: Spray spray adhesive on the exposed edges, then put down clear packing tape on it. Trim the excess packing tape with an exacto knife.
Option 1: Spray spray adhesive on the exposed edges, then put down clear packing tape on it. Trim the excess packing tape with an hammer.
Answer: 0