In your case with what you've achieved in the past I would guess not - I expect you could probably do just as good a job (if not better if you remove the old rust first) with a can of POR15.

To put my comment in context:- I have no experience of this particular product. I'm wary of no effort cures - I think you always need to work at something like stopping (= delaying) rust.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!