Key Largo, Florida Topics: Black streaking/staining on pontoon boat siding

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	Name:	Lifer -
	Subject:	Black streaking/staining on pontoon boat siding
	Date:	3/31/2013 7:58:03 PM

The problem is caused by electrolysis of two dissimilar metals touching each other. The rails are aluminum and the the fasteners most likely are stainless. What you see is the corrosion of the two running down the side. I have not found anything that will clean it without also eating the paint. I often wonder why the manufacturers don't put a plastic washer between the two to prevent it.