The previous owner of my car fitted a cheap luggage strap ( made of nylon webbing).............Yes I know
It fluttered in the wind and micro scratched the bonnet.
Once scratched ( won't polish out)I have had to find a bigger thicker leather strap.
I used the soft half of Velcro stuck on the back to prevent further scratches.
So Damage covered
I clean beneath the strap regularly and keep it well waxed.
Looks great and problem hasn't got any worse
On balance I would NOT have fitted a bonnet strap but it will have to stay now.
cheap webbing below

Fuller and padded leather strap as now fitted