Not underseal as such, as the modern plastic stuff is so much better than the 'tarbrush' of the 70s and 80s. I do Dinitrol all the cavities, inside the rear wheel arches from inside the car and inside all the doors and bonnet and anywhere else I can stick the lance every 12 months. I do have a proper Shutz gun and cavity lance and a four post lift, so an easy job.
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