I read an article about one called Diamond coat. It was the "once in a car's lifetime" paint protection so you didn't ever have to wax the paint. I guess an ex-employee of Diamond coat said it was just a good quality paint sealant. They would do a good machine polish of the paint and then apply their brand of paint sealant. 5 or 10 years ago paint sealants weren't very common. Now you can get them from most companies so Diamond coat is a thing of the past I think.
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