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I don't know if this product is available in your part of the planet, but I'll mention it anyway, just in case.
I moved into a new house (new for me) 8 years ago. In the back yard was a swimming pool, surrounded by a wooden deck, with a cast iron decorative railing all the way around the deck. The railing was covered with surface rust. My brother works in a local paint store and he mentioned a product made by 3M called a rust restorer. They had another brand made by Rustoleum which was supposed to be just as good.
What I had to do was use sandpaper on the iron to get the loose rust off, but only the loose rust. Then I applied 2 coats of the rust reformer, then a single coat of primer that was made for metal and exterior rated, and a coat of black glossy paint made for metal and exterior rated.
This railing has been outside in the rain and snow for 8 years, sometimes the bottom half is covered in snow for 3 months. It is just starting to show the slightest signs of rust after all this time outside. If you were to use this on your dob, which I'm sure you will not leave outside in the snow and rain, it will probably last for many years.
Hope this helps!
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