I have read your initial post and in your end three points it sums up what you are after...
1. Replace bar
2. Discounted rate for a bar
3. Fone to acknowledge your complaint
You bought second hand so neither of these options belong to you except number three. Warranty is for people who buy new gear.... I have boughten many used kites at a great deal and accept that I am doing so at my own risk. I still don't see why you think Fone should replace your bar for some discolouration? You haven't indicated that the bar is brittle or rather that there has been any issues. If you feel the bar is unsafe than don't use it and avoid buying from that brand. You placed a warranty claim when you started dealing with whatever rep you sent the pictures to. It isn't that I don't understand your concern about the issues that these bars are experiencing but rather why you are on an international forum slagging them. If it was a new bar and they did this than people should be made aware of it but it isn't!
You don't have to like my opinion Wetdog and do whatever you feel that you need to do! Sometimes the best advice isn't the one we want.
Soul19 you are wrong, on all point, the F-One bar issue at this stage is not a warrantly case because it's not a manufacturing defect but a design defect. Ask a lawyer before speaking your truth, F-One should recall the bar! In case of injury they can be prosecuted for negligence. In the law there are no time limitation regarding strict product liability. Wetdog feel free to contact me, F-one must change your bar even if it's 2nd hand.