Jak Snow spray protects nubuck, suede, and canvas materials from the elements. It's not meant to be used on polished or smooth leather. Magic Spray's patented formula contains pure, particle free Silicon Dioxide – SiO2 – which means that it contains ‘pure glass’. The glass is in a molecular form and is held in a liquid. It doesn’t become ‘glass’ until it’s allowed to cure (which takes approximately 24 hours). Hence your shoes and bags are only protected 24 hours after they have been sprayed.
SiO2 is completely inert, harmless and indigestible, with zero toxicity. It carries no allergic warnings and is environmentally friendly. It is commonly found in nature as quartz, the most abundant family of materials on Earth.