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Very good , well worth doing . What under seal have you used ? Looks tidy
I used a 4 stage product from rust busters.
First jetwash the arches
Apply the salt removal product and wash off
Apply the caustic heavy duty de-greaser and then wash off
Use some rust converter on any parts if there is any ( mine didn't have any really )
Use the 2 part epoxy coating system ( mix 2 cans together and apply ), I slapped on another coat when dried for double protection.
The epoxy stuff is really good and solid and also protects better than any wax or underseal so im told.