Polyester Primers

AdamR said

$444 a gallon !

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No, that's for 4 gallons. You can get it cheaper at places like Smart Shoppers:

http://www.smartshoppersinc.com/AutomotiveFinishes/Clausen_Primer.html

It looks like an interesting alternative to other systems: http://www.smartshoppersinc.com/automotive-refinishes/ClausenComparison.html