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Azdel Explanation & Benefits with Josh the RV Nerd. Coachmen RV uses Azdel Composite Panels to replace wood in the RV sidewalls. What is AZDEL and Why is it better? Find out! Plus an important product update! 16,903. Before you buy your next RV make sure it has Azdel Onboard. Azdel is a composite panel used by top travel trailer manufacturers as an alternative to Luan or.