Do you need to apply a VHT paint or is hammerite got enough high heat properties
I've used Hammerite with good results.
This has been going on, to my knowledge, ever since I had my Golf Mk iv new. I've seen brand new cars in the compound with rusty hubs. Shouldn't happen on any car, these days, as there are plenty of ways of stopping it which wouldn't cost a lot. I reckon it's just one of those things that "have always been done that way". Lazy!