We formulated Armor Shield IX so that it can bond with virtually any porous surface that is solid in structure, and repel all manner of foreign matter, including other surface protectants. That's why only 1–2 layers of Armor Shield IX is all that is needed to protect a vehicle from the elements.
And while you will not gain any additional protection from stacking multiple layers of Armor Shield IX, a second coat will help ensure that every portion of the vehicle has been covered.
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