Also should ad into the tutorial thread that if you have visible damage while mirrors are still on but its not to far down, grenador style mirrors actually go lower and will most likely cover up the damage.
as I said when writing the tutorial, if you can already see rust while the mirrors are on your going to find significant rust underneath.
If people dont have rust thats visable id still be pulling the mirrors off, removing the foam and treating the area as on a 10+ yo car its going to be present...