HYDRO-SLIDE™ - slide spray concentrate and applicator for trombones. When added to water, Hydro-Slide™ forms an extraordinary lubricating fluid. It is designed to be used with or without slide cream to for an unusually smooth slide action. Follow the directions on the Hydro-Slide™ applicator bottle. Fill the applicator bottle with water to the "water line" then add Hydro-Slide™ concentrate to the desired level (1:40, 1:20 or 1:10). Mix thoroughly and spray on the trombone slide as needed.