Hi Ward,
Prima Epic sealant, two layers over 18hrs (12 hrs curing for first layer, 6 hrs for the second).
Not sure what you mean by Opti-Coat equivalent? Opticoat is a professionally applied permanent coating, as opposed to a sealant, so unless it's machine polished off it shouldn't need be re-applied/re-sealed
Did you maybe mean Opti-Seal? If so, it's a very good product and worth sticking with if you're happy with it.
The only reason I use Epic (aside from it being a great sealant) is because I like Prima Amigo to go underneath it. I've found Amigo really brings out the fleck in metallic paint beautifully. It also has a slight darkening effect which helps add a touch of depth to metallic and non-metallic paint. I use Epic because I like to keep the glaze and sealant within same family.....cross-linking polymers and all that
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With Opti-coat and Opti-Seal you have to have a bare paint surface. In other words, no glazes like Amigo can sit under it otherwise it won't bond properly.