What is the stuff called that Clark Griswold puts on the bottom of his sled in National Lampoons Christmas Vacation?

While the product name was not revealed, Clark Griswold (played by Chevy Chase) coats the bottom of his sled with a super-slick, experimental substance his company is working on. This caused him to blast off down a hill, crash through various structures and slide across a busy street until he finally stopped at a Walmart parking lot.

Clark: "This is a new non-caloric silicon-based kitchen lubricant my company has been working on. It creates a surface 500 times more slippery than any cooking oil. Ahhh! We're really going to fly down the hill with this stuff."

The product made us think of this one which actually came out in 1961.

Of interest, the film National Lampoon's Christmas Vacation was voted on the Top 10 Greatest Christmas Movies of All Time, but A Christmas Story is still considered by many to be the greatest holiday movie of all time, according to nearly 700 fans who voted on a Ranker.com poll.