Cast iron radiator finish


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Old 09-11-07, 07:14 PM
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Cast iron radiator finish

Hello,

I just got my hot water radiators sandblasted to bare cast iron. I know that that most people would paint them to prevent rust but I would prefer to obtain the authentic look of blackened old cast iron (some sort of chemical patina).

I thought of gun oil but the label says that it can emit toxic vapors when heated (not good for a radiator).

Does someone have an idea on how to obtain that kind of finish ?
 
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Old 09-11-07, 08:24 PM
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Clear Finish

I don't know if they make a "high heat" clear finish or not. I would think regular automotive clear coat would take the heat but it's safety??? You would almost certainly have to use some sort of primer or base coat & I don't recall ever having seen a clear primer.
 
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Old 09-12-07, 06:17 PM
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Well, there is always black stove paint, you could thin it and paint in on, that would give it that oxidized look. I'm trying to think of what chemical I was playing with the other day that stained some steel I was working with. If I remember, I'll post again. Most oils will also end up staining steel when heated.
 
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Old 09-13-07, 10:52 AM
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Thanks for the tips.

I heard about that stove finish products and might give it a try.

I also know that phosphoric acid can darken steel but that wasn't convicing on the cast iron.
 
 

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