Tinting options, fastback cuda rear window?

Took my car to a tint shop last year to get the back glass tinted on my car. He told me I wouldn't be happy because of the 52 years of dirt in the gasket. He said the tint would lift on the edges eventuality and it would amplify every scratch so I never did it.
My carpet is fading on the side panels too. Thought about dying them black again.