For the coating to be used indoors and outdoors, it must be fire tested to meet strict fire safety regulations. VFI has several formulas that are great for indoor and outdoor applications: VFI-2626 65 D Brushable Hard Coat, VFI-6170 70 D Spray Hard Coat, VFI-6171 70 D Qwik Spray Hard Coat, and VFI-6185 80 D Machinable Hard Coat.