Some might recommend various waxes and protectants (such as Aerospace303) but I think the single, most effective way to reduce or prevent cracking and/or peeling of decals is to keep them away from long exposure to the sun and heat. The combination of UV rays and high temperature is not a good mix for decals - especially those decals found on earlier 2000 RV models.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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