Question about Rosenstein & Söhne Hot Air Popcorn Machine

It is not recommended to add sugar or salt directly to the hot air popcorn machine, as sugar can caramelise at high temperatures and could damage the machine. Salt often does not stick well to dry popcorn. Instead, you can refine the finished popcorn with melted butter or salted butter or sprinkle salt over it with a salt mill to make it adhere better.