Hi & Welcome Id ask a mod to move this to the Painting & Modelling section. Any questions regarding P&M go in that section to ensure people will see it. A primer is a primer.. meaning it has specific properties that give better adhesion to give a surface for later layers of paint to attach to. So Unless it says primer, its not a primer. Not saying using black spray won't work, but this depends on the spray. Some spray paints can go on really thick and might not work well with miniatures. You could always use a grey primer, and then use the black as a basecoat layer on top, followed by the zenithal highlight. Be mindful if you go on too thick you will start to lose detail. The key principles is as thin a layers as possible.
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