I'm not sure what Supagard is, but what you're looking for is a sealant, as opposed to a wax.
Collinite #476 is supposed to be long lasting
There's also the Zaino sealant kit
Those are just two I can think of.
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Was: 2008 335xi sedan 6MT Black Sapphire Metallic
Is: 2014 Tesla P85D (Blue Metallic)
Wife's: 2013 Infiniti G37 S sedan 6MT, Black
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