Divert the exhaust with a tip bending it from flowing directly on the fiberglass. Put an attractive metal plate over the delamination to protect from heat. Perhaps use a small gap between fiberglass and metal plate to stop heat conduction.
Perhaps if you add details to your question other suggestions could be made.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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