Has anyone tried this product?

This sounds a lot like the many over priced products that claim to be able to restore vinyl trim on vehicles. Looks great when first applied, but the shine quickly fades and you end up where you started. None of them I have tried lasted anywhere nearly as long as the manufacturer claimed they would even when the vehicle was stored indoors out of the sun.

But they do have a "free" sample that only costs $4. Give it a try and see how it works, how long it lasts, how far it goes, etc. If it really does work well maybe it's worth the price.