Intergard 291Description A two component epoxy anti corrosive primer. Technical Information ntergard 291 is preferred for use with systems for chemical environments where zinc based materials can be subject to attack in both acidic and alkaline conditions. The maximum overcoating interval will be dependent upon the integrity of the exposed film. A film of 75 microns (3 mils) dry film thickness will normally be overcoatable after 6 12 months exposure (depending