The Chevy Avalanches had a serious Cladding problem..the plastic lacked a UV inhibitor when mixed...and Chevy at first was fixing these with a product called Armidillo...it was not a permanant fix...any type trim dressing will fail in time....
little info on the problem
Cladding trouble
Soon after the release of the Chevy Avalanche customers began to notice cosmetic problems with the cladding on their vehicles. Over time exposure to heat and sunlight would cause a chalky faded appearance. It was especially noticeable on the cargo bed panels, and sailpanel windows where "Zebra Striping" would appear. Customer reaction to this problem resulted in General Motors agreeing to a one time treatment of a product called ArmorDillo. This product would temporarily restore the cladding for a period of about 6 months. After that it would wear off then need to be re-applied. Realizing this was not a permanent solution, GM, together with Gatorback Coatings, developed a coating that could be applied to the cladding to restore it to a like-new shine. This product was designed to etch into the plastic and bond a new layer of tinted acrylic over the faded plastic. Customers within the 3yr/36,000 original factory warranty could go to their dealership to have it restored under their original warranty under GM TSB:04-08-111-001C. With the exclusion of side body cladding on the 2007+ model years this has reduced the amount of cladding fade. General Motors has also identified the original source of the faded cladding. With that information they were able to reduce the cladding fade problem on the GM GMT900 platform.
Now a company came to the rescue to fix this issue..called gatorback....I know people who did this treatment and no issues after....
here is the company who makes the product...its a great UP sell to any one who encounters this problem on a detail of such vehicle....
Welcome to GatorBack: Home of Automotive Plastic Restoration Products
Now what happens with do ing trim dressings is later on you get the zebra stripe effect as it slowly deteriorates...and looks worse some times....
Hope this helped....
Al