Now my next few days off are booked in with changing the brakes and renewing the caliper seals i think it would be a good time to start tackling the under body rust. Nothing major just surface rust but want to get it sorted before waxoiling the whole car. I plan to wire brush then coat with something. I was thinking of hammerite straight to rust (black) or use their converter (dark brown). obviously the converter would need to be over painted, but which would be the best option?