Anti-corrosive system: VOC content of individual components

Dear all, The Contractor needs to install anti-corrosive paints / coatings for one project. The anti-corrosive system consists of 2 products (the first being an epoxy primer and the second being a polyurethane coating). I am assuming that, since this system is for anti-rust / anti-corrosion, both products have an upper VOC limit of 250g/L. Is this right, or should we consider the primer to have its own VOC limit (50 or 150g/L depending on whether it's flat or non-flat)? I feel that all the components of the anti-corrosive system must be treated under the same category with a maximum allowable VOC content of 250g/L. Any thoughts on that? Thanks..