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Hi,

I just had a few cast iron radiators sand blasted and I was all set to paint them. Stupidly I left them out on my deck this morning with the intention of spray painting them when I got home from work. Well – it rained and they got wet and despite my best efforts to dry them immediately they’re covered with a thin film of rust. Can anyone tell me if I can go ahead and spray them now – after rubbing the rust off as best I can with a towel – or do I now have to thoroughly remove the rust somehow? Like maybe with some kind of rust converter or something. Also – should I use some kind of primer coat – and if so – what kind? I watched a This Old House video called How to Paint a Cast Iron radiator that specified that the radiator should be primed first – and they showed the guy priming it – but didn’t specify what product they were using. So if anyone has any advice on what kind of primer to use I would love to hear it. Presumably it has to be a high heat product. Thanks for any relevant advice.