Fire retardant spray is used for protecting different substance and fabrics from flammable combustion. They can be used on many different products such as latex, wood, paper, and many other fabric material objects. A good fire retardant spray can be created from home natural ingredients to cover surfaces and protect furnishings. One way to make your own spray is to get a spray bottle and remove the top. Get a funnel then put it on top of the bottle and pour boric acid with hot water into the funnel. When finish seal the spray bottle and test out your home made fire spray retardant.