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4130 question

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ndlakesdreamer

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Ran into something new to me while preparing my fuselage for zinc primer.
Anyone seen a spiral pattern on 4130 like this?

Second question anyone ever seen surface features like the second pic? I'm more concerned about the surface irregularities than the spiral.
20220906_122744.jpg

20220906_122834.jpg

Thanks
Dale
 
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