Join Date: Nov 2011
Location: Temescal Valley, CA
My first thought was rust, but if there is no rust corrosion present then it sounds like the paint just did not adhere to the tank well. I have had this happen on other surfaces if I did not prep and primier the surface correctly. If it's solely on the back side of the seam, maybe you can clean, prep, prime and touch up the spot (keep it from rusting).
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2010 900 Classic