Quoting from the CompositesWorld web-site, the spray on protection could be the panacea for lightning protection, easy to apply and easy to repair:-
NIAR’s Kostogorova-Bellar and Paul Jonas, director of NIAR’s environmental test labs, are conducting a U.S. Air Force-sponsored study on direct and indirect lightning and EMI shielding protection schemes for composite structures. One promising system is a conductive paint from Conductive Composites, in which the company disperses its nickel Nanostrand material. Formulated to handle lightning strikes in Zones 1A and 2A, the paint reportedly offers what Kostogorova-Bellar calls “superior” performance when compared to baseline LSP protection, such as aluminum and copper expanded foils and woven wire materials, including phosphor bronze. The paint, which reportedly can be resprayed in the event of damage, is expected to be a good alternative to the other methods.