That's my method. A light epoxy and a gloss coat of black, not necessarily thin. I just did my '66 vette 427 rad. that way. I was a little disappointed they only could find a 38 tube core, the original was 28. Nobody will care but me, and I really don't either. I called dewitts and asked what they did, they use their own product called "black ice" but basically told me don't overthink this. I do like a gloss coat, non flattened.
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