Effective by penetrating into the raw, porous substrate to inhibit the ignition of the substrate, these water-based, non-durable (will wash out) liquids will dry clear. The products for fabrics will make the fabrics passable for NFPA 701. Keep your original container, and if possible, treat an extra sample piece the same way as your original, for the fire marshal.
NOTE: Longevity of any FR additive depends on the use of the treated fabric (and how much it is handled) and the environment (mostly humidity and environmental changes) in which the treated fabric lives. It also depends on whether the treated fabric is clean or has been accumulating dust (stage dust, shop dust) and/or air-borne oil particles (from a restaurant or cafeteria kitchen).