Here is what I think should happen: - captains who got the boat for steel should keep the current camo. - when it rolls out for coal, it comes with a new camo. Only steel purchasers keep the old camo, and  get the coal camo for free. Now coal purchasers can never get the steel camo. You have to set a precedent and incent people to buy boats for steel, otherwise they could just wait around for it to get switched to coal.