We were also concerned about this. We didn’t want to promote a product that solves one problem on a metal roof, while creating another. Our first S-5! prototypes utilized setscrews with a common “cup point”. But, we noticed that such screws gouge the finish of the panel. With the metallic coating breached, premature corrosion is imminent, and any warranty is violated and therefore nullified. So, we went to great lengths to have special stainless steel setscrews custom made to our exact specifications. The point of the screw is rounded to a specific radius and polished to eliminate abrasion to the panel finish when tensioned. We also the use of these special type screws. More info
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