Rosco Flamex SF is for treating synthetic fabrics that can be difficult since the synthetic threads of the fabric do not absorb liquids in the same manner that a natural fiber does. This formula is designed to be a penetrating treatment that bonds to the surface of the threads deep within the weave of the material, securing the flame retardant chemicals and rendering an effective protective treatment. Treats many synthetic fabrics such as polyesters, nylons, acrylics and rayons, as well as most cotton/synthetic blends. Always test a sample to ensure compatibility and effectiveness. No residue or powdery build up. (Expect 500 square feet of coverage) 1 Gallon. Click here for MSDS: MSDS