Rosco Flamex for Natural Fiber Fabrics - 1 gallon Most fabrics of natural fibers can be treated using Flamex NF. Easy to use with no greasy after efffects. One gallon will treat approximately 500 sware feet. Can be applied using either Dipping, Brushing or Spraying techniques. Over saturating the fabric may cause it to stiffen or otherwise alter its hand. Best to always treat a test sample to determine how the facric will react.