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The only "right" primer is the one recommended by the finish paint manufacturer. And since you want metallic gold, good luck. First you'll need to find a metallic gold paint that you like the color of--they all vary and vary more as they age--and then you'll need to find it for marine use, or at least outdoor use in the damp. Since most of them use bronze dust or similar "golden not gold" pigments, they're all susceptible to oxidizing, especially if you don't clear coat over them.
There are some very real and practical reasons to use a high quality "gold" vinyl. It is going to look much better, last much longer, and be much cheaper.
But if you really want to do the job right, then you prep the surface and apply genuine 24k gilding where you want the stripe. And overcoat it with a UV protectant or varnish. And do your annual maintenance, re-applying as needed. Gilding is still the ultimate gold finish, and surprisingly affordable since the gilding foil is so exceedingly thin that it is affordable.
Last edited by hellosailor; 07-26-2009 at 02:52 PM.