Our previous TT, (Outback) front cap started fading after 1 year of ownership (new). It was just out of the one year warranty when fading and discoloration started. I attempted all kinds of fixes and it seem it only made it worse and worse. I finally consulted with my purchasing dealership and they told me the paint itself used was inferior, not automotive grade and nothing would fix it except to repaint it.
They contacted Keystone and after some back-and-forth negotiations, Keystone agreed to pay for the repaint. However, I had to pay for new graphics. The deal was struck and about 4 weeks later we had the trailer back.
Before repaint:
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And here's what it looked like after we got it back. We had this TT for another 4 years and when we traded for our current 5er, that front cap still looks just as good as when it was first painted.
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