I would like to repaint just the fin half of this radiator that is rusted. I would like to know of there is a special treatment due to rust that I should do. I do plan to sand the rust with a grinder and a flapdisk.
Radiator rust recovery
paintingrust-removal
Related Solutions
Is the garage door made out of steel? Here is a good article on repainting rusty steel:
I think the key is to prep by washing the area and then removing as much rust as possible by scraping and then using a wire brush (or even sanding). Prime the area with Rustoleum. The topcoat should be high quality latex exterior paint.
No. The rust is inconsequential and those pipes will likely outlive the gas meter equipment itself. The reason that the rust is at the threads is because the threads are not painted well on purpose; it prevents a good seal when they're putting the gas meter together.
Depending on your gas company's policies, painting the gas meter could be a violation of your customer agreement with them.
Using evaporust, CLR, TSP, or some other cleaning agent on the threads could dissolve the pipe dope and cause a leak. I would leave it alone.
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Best Answer
that looks like just surface rust. wipe it with strong citric acid or some commercial rust remover (like CLR or Limeaway). if it all comes off, its just some rust that has dripped down from the upper port. assuming there are no current leaks, you can just wirebrush it off and seal with a rust converter (corroseal or 3m marhyde are by far the best at this job) and then repaint the whole thing with a good quality latex or polyurethane (it will flex when heated).
just be gentle. remember, a radiator is a pressure vessel full of hot water.