Wax

Wax is an item that players need when completing Troll Romance, a quest. They make it by using swamp tar on a bucket of wax with a cake tin in their inventory.

They use it on a sled to protect the wood and to make the sled more slippery. This returns the message: "You wax the sled. You're now ready to go."

Trivia

 * Even though all cake tins are dark grey in game, this one changes to green.