I would avoid using Hammerite- if ever a paint is over exaggerated then this is it:~
As always preparation is the key- clean all surfaces as best you can & if down to bare metal give it a coat of Jenolite rust remover/converter (remove heavy rust) once dry paint the areas with a Zink rich primer or Red Oxide primer.
Top coat in something like chassis black or one of the better brands rust preventative paints. Finish with the likes Dinatrol wax treatment.
The proper base treatments of the metal are the key to keeping rust at bay.
Bob.
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