About re-painting old cast-iron radiators

Old 08-29-07, 11:10 AM
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About re-painting old cast-iron radiators

As mentioned in a previous post, I am repainting a few cast-iron radiators. The original process was: a) sandblast, b) spray prime with two coats of Zinsser 1-2-3 (waterbase) ; c) spray paint with Modern Masters metallic paint (waterbase). All this is taking place in a properly-conditioned detached garage.

There has been a little change of plans. Since sandblasting was taking too much time (due to several old paint coats), my contractor and I decided to expedite the process by first using some paint remover, scrapping a much as possible, and then sandblasting the remaining paint. We have been using at least a couple of stripper brands (whatever he and I had around), some of which cleans with paint thinner, some with water. Question: how to clean the radiators after stripping/sandblasting. If water, I am a bit concerned about rusting. If paint thinner, I am a bit concerned about leaving an oily residue that may interfere with the priming stage. That said, I was thinking, first paint thinner, then some water, then wait until fully dry, then prime (then paint).

Old 08-29-07, 01:59 PM
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it's been over 30 yrs since I've painted radiators but...

..I'd be concerned about rust, using latex/waterbase paints on cast iron. I'd clean with paint thinner and then prime with an oil base paint. If it is primed well you may get by with using the waterbased top coat.

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