It should not cost much to respray the bonnet, which is easy to take off and replace. Then you can have 5 or 6 coats applied with a rub-down each time, before the clear coat. I had my wife's Jetta done, which also has a sloping bonnet like the Jazz and the difference was marked, a much deeper gloss. Now, after 2 years there are a few marks from stones, but no chip marks.