Gehrkes ® is now 28 years old. It is the first commercially offered, safe, dry fly dressing that floated flies repeatedly. Its' features and functions are unique in the world of chemistry and fly fishing. Gehrkes ® has a specific gravity of only .77% that of water, which means it's lighter than water. Gehrkes ® is a liquid emulsifier that permeates deep into the body material of dry flies. It will either coat sythetics or penetrate fur or feather.