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over the bare metal areas you should spray a coat of epoxy primer.
in most cases with epoxy primers you can go wet on wet. this means you let the epoxy flash off for 15 to 20 minutes and then you can spray your filler / build primer.
beside to make sure you can go wet on wet with you epoxy primer before you try doing so.
the epoxy will or should do two things for you one is give better adhesion for the filler primer to bite into the other is give better metal protection than the filler primer will.
there is no need to spray everything with the epoxy it's only needed over the bare areas so you wouldn't need to buy as much of the epoxy if you only have a few areas of bare metal.
you would want to spray the epoxy on areas bigger than the size of a US quarter.
you also have the option of not using the epoxy and using a DTM filler primer.
DTM= Direct To Metal.
personally I'm not to into DTM filler primers they in most cases will not give you the best metal protection. they are made more for collision shops to speed up cycle times to get the collision repair out the door.
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