As has been said, the Dicor is incompatible with some plastics (but not all) and can cause deterioration. There is no point in putting Surebond (or other brand) over the Dicor, so either remove it and use something else instead, or just leave it there and see what happens long term.
I use Geocel Proflex RV on mine.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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