... most well-seasoned coin collectors and top-rated coin dealers across the country want nothing to do with PVC flips? Major coin supplies dealers all tout NON PVC flips. Even the slabbing/grading companies will not grade a coin that exhibits any trace of PVC damage. This subject has been well researched and written up in the major coin publications for years and years.

Here's an informative link for your consideration;
http://coins.about.com/od/caringforcoins/f/pvc_damage_faq.htm