Hi,it came to my attention last year while servicing various customer cars that and only on the non galvanised chassis cars(2015 to the end of production)that corrosion was creeping out of the strengthening panel under the washer bottle,after investigation and one customer allowing me to cut the panel off I found a lot of corrosion and can only assume the panel/chassis wasn’t painted with a weld though primer before being welded on,I have repaired three cars now and all low mileage,only real option is to cut the old panels off and repair properly,

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