I bought some perma white to paint my radiators but the tin doesn't say it's for metal so would it be suitable. This is the tin I bought.
I read perma white is good on radiators but I don't know if they changed the paint when they changed the tin.
On that basis you will never be satisfied as you would be left in doubt, as it is excellent in areas of high humidity that would also indicate it can cope with areas of temperature change also, in that case suitable for radiators.