Painting Cast Iron Radiators with flat and Rustoleum Glossie?

Will these paints have a problem when hot water goes through them in winter?

Answers:
no problems i have and had cast iron radiators in almost all my homes in ne. pa. since the early 60's,most of which were painted with a rustoleum paint in a spray or brush type,and alot where painted black or silver an occasional cream or white color ,most of them last about 5 years before you may need a touchup.

Other answers:
They make a paint for radiators. See link.

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