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I have a 10 year old Audi that was pretty good, and rust free except for a couple of dings from rocks coming off the windshield and striking the lip of the roof (no mouldings around the window). I eventually had a shop take out the front window and do the rust repair/repaint because it's so integral to the car - a rust hole there would guarantee water in the car and roof.
So I went nuts on the FR-S. Clear bra for the bumper, first 18" of hood, A-pillars (looked really vulnerable), the leading 12" of the roof, and the sill for the trunk. Half of the price was for the bumper which being plastic would even rust anyway.
I have 1 noticeable scrape on my Opti-guard treated paint in 40,000 kilometres. In that time I have repaired 3 windshield cracks. The 4th went unnoticed until I got in and found a crack in an inverted U meaning a windshield replacement will be needed. So in my case at least I believe the bra has probably saved me from numerous rock damage events. YMMV.
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