I'm looking to achieve a 30 minute fire rating on an indoor (domestic) vertical steel box section (2200x100x100) which is currently primed with red oxide paint. Could you advise me on the cheapest, simplest intumescent paint product for achieving this with a brush/roller please.
Assuming the section has a wall thickness of at least 4mm, you would require 1 litre of Zeroflame Aquasteel WB+. If the steel is to remain visible in the property, this should be topcoated with Zeroflame Aquasteel WB+ Finish.