I am going to reiterate what several people have already said over on YouTube, it looks like the spray is essentially a salt water effect which can be easily recreated by applying table salt to wet watercolor or spritzing your piece with water and applying table salt. Once the piece is dry, dust off the salt particles. Its considerably less expensive. The Granulation Spray might just be salt added to hot water so that its been made into diluted saline which you could do yourself as well. Really, I feel like Schmicke is just charging a lot more money for something watercolorists have been doing for years.
I am going to reiterate what several people have already said over on YouTube, it looks like the spray is essentially a salt water effect which can be easily recreated by applying table salt to wet watercolor or spritzing your piece with water and applying table salt. Once the piece is dry, dust off the salt particles. Its considerably less expensive. The Granulation Spray might just be salt added to hot water so that its been made into diluted saline which you could do yourself as well. Really, I feel like Schmicke is just charging a lot more money for something watercolorists have been doing for years.