It can be flameproof both natural and synthetic absorbent materials such as fabrics, cardboard, foam, paper, hessian and untreated wood. The treatment will last the useful lifetime of the material but should be re-applied if the material gets wet.
Fire retardants work by creating an invisible layer on contact that, when exposed to heat, creates a carbonized shield that deflects heat. Our retardent is not suitable for painted, varnished, waxed or waterproofed materials.
Note - as with most retardants, this will tarnish metal (curtain rods, fabric staples, chrome legs, etc) so wipe off immediately if unable to mask