Homemade chin spoiler looking for some feed back please.

Made a plug then a mold and my first one is on my car. Thinking I'll sell a few and looking for some opinions on what they would be worth.
Made out of fiberglass using a good quality woven cloth and Polyester resin. They are strong and the first 3 I used bedliner on for protection from rock chips.
This is my 2nd design and the first one I had held up real well after 9,000 miles it is still in good shape.

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