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Old 09-17-2012, 08:01 AM   #10
dcramer
5th Gear Member
 
Join Date: Nov 2010
Location: Orangeville
Posts: 1,109
According to this http://ziebart.mb.ca/home/content/view/55/2/ they only work in the sense that the seller gets richer.

Admittedly this is from a zeibart site, but a little googling will find you another study which yields the same results.
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