When compared to commercial adhesives, the cooking oil glue either matched or outperformed them. But soon, they could be replaced by comparable materials made from cooking oil that is no longer usable. Now, oil that would have otherwise been thrown away has been turned into another kind of eco-friendly polymer—an absurdly strong glue. Related Story How to Remove Sticker ResidueTo synthesize polymers, Mahadas and his team broke down the unsaturated fatty acids and glycerol in cooking oil into monomers. It could also be molded into a glue stick and used in a hot glue gun, just like the EVA glue sticks available in craft stores.