It was on a bike I've now sold. So can't say really. But you've reminded me that I should do same to my CX bike.
I have a nice frame that unfortunately looks a little rusty in the tubes. I was thinking of giving it an evapo rust bath and then treating it. Either with the stuff you said, or frame saver. Acf50 seems much easier to get hold of!
@Sparky started
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It was on a bike I've now sold. So can't say really. But you've reminded me that I should do same to my CX bike.