Macropoxy C401Technical Information A two component, surface tolerant epoxy, pigmented with micaceous iron oxide. Where To Use For use as an undercoat in conjunction with other Macropoxy high performance primers. Without topcoat, the material will quickly discolour and patchiness may be exaggerated due to fi lm thickness variation, but will nonetheless provide corrosion protection as a single coat protective epoxy nor will intercoat adhesion be aff ected by any