Very good product especially effective on very small hard to gink dries. Simply dunk your fly into the chamber at the top of the bottle and invert to cover fly with liquid silicone oil. The liquid is in an ingenious glass container, which allows the fly to be held in a compartment, thoroughly coated and easily taken out again. Hour Glass Dry Fly Mucilin Compartment in lid ensures the fly is fully coated. Place the fly in the top of the bottle. Rescrew the cap and invert. Again turn the bottle and remove the fly, now the lfy is completely water repellent.