I under stand what you are saying Tony.
With a hole that size its a great opportunity to clean out all the loose rust inside. I did mine from the front using a length of conduit attached to the vacuum cleaner and afterwards sprayed the inside with a product called EXTROL. It totally seals the surface and is impervious to air. 2 coats is sufficient to seal the metal.
For spraying inside I used long length of hard 10mm PVC pipe attached to a degreasing type spray gun, bought a small brass spray head that had minute holes in the side around the circumference and also in the end. Also used it to also do the chassis rails on my old Daimler Mk2. It drips everywhere and if you catch it in tines it can be reused.
Good luck, keep up the good work
Peter


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