Is this just for the housing of a baseboard hot water radiator (not
steam)? If so, you could use latex paint. I have painted mine over the
years and never had a problem. They don't get that hot. I have even
painted the a small section of the hot water pipes (don't know if it
was a good idea but hasn't been a problem) which heat up to 180
degrees with latex. If it's steam heat, then that is a different
Probably, they don't get that hot. That said if you have the
opportunity to do so the radiators would probably work best if
stripped bare before painting, so there's only a thin layer of paint
between the cast iron and the air.
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