<human>: How do you do this: How do I ensure the mold is sealed when making a concrete countertop?

OPTIONS:
- You'll need to properly seal the mold using a screwdriver. You want the caulk to have extra clean edges.
- You'll need to properly seal the mold using silicone caulk. You want the caulk to have extra clean edges.
<bot>: You'll need to properly seal the mold using silicone caulk. You want the caulk to have extra clean edges.