If there is a small thins rust film, the best to do is using Owatrol. Apply it 3 times (spray or paint= to the rust. The rust is needed, it doesn't stick on coated, painted fine surfaces. Owatrol creeps extremly well into all parts and even into stacked rust. It isolates the surface from oxygen permanentely and thereby it stops rust. It gets solid but stay flexible. You can apply paint to it. I recommend to use Brantho Korrux 3in1, which is a very rigid 1K-coating (50% solid particles in the spray!). You also can stay in the family by using Ovagrundol O.H. chassis coating. If you want to go with a 2k-coating on Owatrol use Owatrol CIP as a separating layer.
If you want to protect and seal folds, you can use Owatrol, as well, even if the surface is fine and no rust is present. I put Owatrol in every fold inside our Defenders (base plat eto side walls etc). To prevent water coming in and staying the the folds. Apply it and wipe away what is too much. It cerates a thin yellow transparent coating.
Use Fertan if there is more serious rust and you may need to do a repair. Fertan also protects. I restored already things by convertig rust with Fertan and then I applied Brantho Korrux 3in1. Works very well. There is also Fertan chassis protection available. You can put many coatings on Fertan rust converter.
AWo
Agreed, Owatrol is right for the job. Being the "go to" product for marine use just about says it all.
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