First a good anti static/anti-erosion coating should be applied to the frontal area of the radome. This balance of the radome surface then should be painted with a product having a composition that promotes static bleed-off. The anti-static/anti-erosion coating should not be over coated with the second material.
Lighting diverter strips extending from the frontal area of the radome to the airframe should be part of every radome installation on high speed aircraft. These diverter strips continuously collect static build-up from the surface of the radome and conduct it to the airframe without severe sparking or arcing.