Obviously a crack is one thing but Novus Plastic Polish #2 works wonders on PSA cases with superficial scratches. I rarely send any in for reholdering. Unfortunately it doesn't work nearly so well on SGC cases which are also IMO much more prone to scratching and scuffing.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
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