Honestly I don't know about the cost.....last I knew it would sell for around $90 for several ounces. That amount should do at least 3 sedan size cars or at least 4 Porsche size cars. We charge $150 for a coating application on top of what we charge for paint correction.
So if it costs $300 for paint correction add another $150 for the Opti-Coat.
We (or the installer) guarantee the Opti-Coat against failure in the sense of durability. We don't guarantee against hard water spots or etching from eggs, bird bombs, etc. We sell it like this: Opti-Coat is a paint sealant on steroids. Think of it as giving you all the benefits of a wax or sealant (gloss, shine, protection) but with at least 3 years durability.
As for Corvettes.....it works fine, as well as on boats.
Anthony