hi I need to paint the cast iron columns in the mill we are converting the are 150mm Diameter x 3.05m tall, they have a cast iron sadle on the top of them which caries the 20x8" pitch pine main floor beams, I've calculated the are of the column and saddle to be 2.1m2 and I have, 24 to paint on phase 1, the ceiling is 60mins fire protection so I'm assuming the columns need to be the same. I'd like to paint them in our company colour afterwards as well if that has any bearing on which paint I need from you, could you tell which is the most cost effective way