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Sonax neg shield is a stand alone product very easy to use. You don't needy to top it with anything. You don't spray net shield on the car you spray a little bit on to a foam pad and do small section at a time . You apply it like opti-coat wipe on wipe off and do not let it dry on the car.
I understand the application method as I have used it before and still have half a can. I was just wondering if anyone has ever used it to top WDGPS. I figured I'd ask for input before I took a chance at trying it. [/
Why do you want to top another sealant with another sealant?
I don't think Sonax PNS and Wolfgang DGPS contains any pork or shrimp. They should be Kosher to be used individually or together. I'd probably use Wolfgang DGPS first, then Sonax PNS second to keep its hydrophobic properties.