Coolant gel is a fire extinguisher.
It is a green gel.
Powers and abilities
Once immersed in the substance, the target is completely trapped.
Scooby-Doo! Moon Monster Madness
While Zip Elvin and Colt Steelcase worked on repairs for Sly Star One, Fred Jones played around with stuff, including the coolant gel which he accidently sprayed on Daphne Blake. Fred was about to help her, when he was distracted by an oxygen and butyl liquid nitrogen tank, freezing himself. The astronauts decided to leave Fred the way he was for about half an hour for the peace, but unfortunately left Daphne struggling in the same spot, too.