Umpie
The discolouration does not seem to be spreading or enlarging. I have tried various cleaning solutions - including Borax but the stain seems to be embedded right through. I am almost certain that these marks are caused by a reaction between the staple and the fill used to cover the staple marks. Also, I am also certain that they are not caused by leaks. It must be a water-based fill and the discolouration is rust caused by the reaction between the fill and the staple.
I have tried using Kilz in a small test area and it seems to have made a very slight improvement. The marks are barely visible. I am less bothered by them now than I was when I first noticed them. If I ignore them long enough, they may eventually go away.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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