Discovery 2 chassis

Hi guys/gals I have noticed that my discovery has had to patches welded on the rear chassis not the best job by the person who owned before me I have noticed a lot or rust on the rear half it is only really surface rust I have had the hammer round it is there any decent rust converters to use to stop it I am waiting for some warmer weather to wax oil it inside and out.

This might help you
https://www.landyzone.co.uk/land-rover/do-not-post-questions-please-read-before-posting.271449/