I can't fathom how this concoction can produce a better product—nor can I understand the intended purpose. In grade school I mixed Play-Doh together with catastrophic results, since then, I left the mixing to Dr. G and other chemist.
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I don't think this will work very well. Poly seal doesn't have a lot of cut in it to begin with and then to mix in opti-seal with it is going to dilute both products. In the end giving you a sub par product. Both were designed for their intended use. Poly seal being an AIO with decent durability and opti-seal as a easy to use sealant with long term durability.
Opti-seal doesn't take very long to apply (whole car in about 10-15 minutes). I would stick with the products separately if you want to see the benefits.
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