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<p>[QUOTE=&quot;Kevin Mader, post: 7775994, member: 106826&quot;]I think Sam raises a fair point here.&nbsp; What are the tolerances for things like surface finish...etc.?&nbsp; Something that doesn&#039;t look &#039;normal&#039; doesn&#039;t mean that it isn&#039;t.&nbsp; I think that needs to be kept in mind.&nbsp; </p><p><br /></p><p>Re: linear plating, the example at Error-Ref shows an irregular pattern.&nbsp; The specimen above shows continuity of direction on either side of the coin.&nbsp; I don&#039;t know that linear plating blisters can&#039;t be less random and more ordered, but this has me thinking there is a different underlying cause.&nbsp; Something in the zinc substrate, perhaps during the rolling operation or perhaps something else.</p><p><br /></p><p>I think this is not a case of linear plating.&nbsp; Looks kind of like a &#039;time-saver&#039; finish from days of old when I worked in a sheet metal manufacturer.&nbsp; Maybe damaged roller surface.[/QUOTE]</p><p><br /></p>

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