Hello, This is not homework etc. I am in the work place (automotive industry) and have a question. It has been some time since I have taken any math courses. I am trying to calculate the theoretical weight of a known coating on the surface of a hollow cylinder and set this up in an excell program. I already have the surface area of the cylinder, but how will I get the surface weight of the coating? Will I need the density and/or approximate thickness of the coating. (I have many coatings to put in the program, but for this example I am using a Zinc Phosphate coating.) Thanks for any help in advance.