That pic looks very impressive!... Since 2008, none of my 4 Boxster's or current 996 cab have ever leaked a drop despite my lack of treatment. My statement is just that...not an opinion on weather to treat or not.
I love the way the top is beading water on your car...it makes your car looked well cared for and certainly doesn't seems like it would be an effective treatment worth consideration.
Thanks for sharing your results!
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