Burn Restore creates a residual non-hazardous breathable barrier on the surface.The product is non-corrosive and water based. Burn Restore is capable of long term damage repair. After the product cures, rain water generally will not affect the permanent surface bond. Burn Restore has no effect on unburned masonry surfaces. The product is designed to be used on smooth face glazed brick that hydrofluoric acid products burn. The product has no effect on glass and will not cure acid burn on the surface. Proven effective; one application has hidden acid burn for almost two decades. If necessary, it can be removed with a pressure washer or by rinsing using a garden hose (with brush scrubbing immediately after application).