Can you stop a cast iron heating pipe from rusting?

Question

If you have a return heating pipe of cast iron that is beginning to rust because of a moist location, can you sand and paint it? Or is there anything else you can do to stop the rust and protect it from moisture?

Answer 1

For cast iron, you will problably want to use Naval Jelly to remove any rust, then use a nuetralizer (tsp or other alternative, your paint store guy can help with that choice) once rust is removed, and the acid nuetralized I would recommend using a heat resistant rust preventative paint (rustoleum make it in aerosal form) That should help restore you iron pipe to new and help keep it that way. Good luck.

Answer 2

After you get rid of the surface rust with other peoples tips -
Add Insulation to prevent future rust. The rust is caused by condensation of moisture with the hot pipes in a cold basement.
Best insulation is flexible foam wrap such as www.armacell.com - For best results, do not leave any gaps, seal any gaps with duct tape , cut corners to fit elbows and valves. PS - this will save on your energy bills too !

Answer 3

If you'd rather not paint...
Clean the pipe well of any dirt or rust. Rub lightly with cooking oil. Pay extra attention to any joints. Buff (a lot) with a clean dry cloth. Repeat every 3 - 6 months.

Answer 4

sand and paint it with a good oil base paint and it will last another 20 years

Answer 5

paint it with coal tar it's cheap and practical

Answer 6

they sell all kind of coatings, pick the one that will work for what you want