Here's what their website says about 303 on rubber.
Quote:
303 Aerospace Protectant For Rubber
From aircraft pressurization door seals to the inflatable boats at Disney World's Typhoon Lagoon or for the rubber hoses, seals, and tires on your vehicle, manufacturers' tests show only 303 protects against rubber's worst enemies, UV light and ozone.
303 Aerospace Protectant is the World's Best for rubber.
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