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<p>[QUOTE=&quot;princeofwaldo, post: 2064350, member: 24091&quot;]I have a bottle of Slab-Renew and have been satisfied with the results.&nbsp; A few things I have noticed:&nbsp; It works better on PCGS holders because the plastic is less brittle than on an NGC holder.&nbsp; Works for NGC too, but it requires a lot more work.</p><p><br /></p><p>Also, standard (non-optical quality) NGC holders are much more susceptible to damage requiring Slab-Renew than PCGS holders even though the NGC plastic is harder.</p><p><br /></p><p>The reason has to do with the tendency for NGC slabs to have convex panels on the front and back.&nbsp; They are supposed to be flat producing a recessed area within the holder, with the edge of the holder higher than the panels when lying flat on a table.</p><p><br /></p><p>This problem (or defect actually) seems to be much more common recently, though even older NGC holders sometimes display the same tendency.&nbsp; Essentially, the plastic portion of the holder directly over the coin is convex and extends out past the rim of the holder.</p><p><br /></p><p>When laid flat on a table top, for instance, the slab will be supported by the plastic over the coin instead of the edge of the holder.&nbsp; It&#039;s actually a defect, but one so common that few collectors pay much attention to it.&nbsp; If the holder spins easily while laying flat on a table, it&#039;s because it is spinning on the surface of the panel directly in front of the coin instead of resting on the holders edges.</p><p><br /></p><p>The resulting damage from that spin is obvious after the first occurrence, the scratches inhibit the clarity of the plastic.&nbsp; Even incidental contact with a counter-top or table will produce this damage instantly, and while it may not be noticable at first, just as with any other circulation wear the damage is cumulative.&nbsp; Even with Slab-Renew, the damage can become severe enough to eventually require the coin to be re-holdered to rectify the problem.[/QUOTE]</p><p><br /></p>

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