I am looking for a clear fire retardant coating for a domestic steel staircase to meet Building Regulations. I want to end up with a natural steel or gunmetal finish. Please could you advise what is the most suitable. I have coated a very small area of the staircase with Jotun steelmaster 600WF. Please could you advise how best to remove this coating back to natural steel. Many thanks Dick Milton 07768708220