Hi.
Yes I lost out.
When I first found the rust around the number plate lights on my estate I was very alarmed and it being the middle of winter I wanted to try to stop it getting worse.This was before I realised there was a ten year warranty against corrosion. So I scraped of the loose rust andbrushed on some smooth black Hammerite. (Car is also black). Briefly, after this I then found out about the warranty and went to my dealership. They weren't aware of any such corrosion problem, hahaha. Was eventually referred to their body shop 30 miles away. They were very helpful and checked the car all over to ensure it hadn't been resprayed in the past. Told them about the Hammerite and said I was quite happy to scrape it all off. They said not to bother and reported back to the dealership. These miserable ******s were determined to follow the company line and said the paint I put on invalidated the warranty. Thats the end of the story. I have since made a more permanent job with the hammerite and it remains fine. The issue in my case is the foam rubber gaskets they fit under the number plate lights that soak up water and never dry out. Desighn error.