Stumped by ‘Covers in Goo’? Here’s the Answer!

1. Sticky substance
2. Proteins secreted by certain organisms
3. Messy material
4. Covers objects in a messy manner
5. Can be found in a ghostbusters trap
6. Often associated with Nickelodeon game shows
7. Sometimes used in pranks during Halloween
8. Could be green, yellow, or any color really
9. Can be fun to play with, but not so fun to clean up