I get why you have to sand a surface before priming – it removes imperfections and creates a smoother surface. But why do you then have to sand again before painting? Surely by doing that you’re just sanding away all your primer?
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When you sand a surface that’s been primed, you’re not sanding away all the primer. What you’re doing is creating a slightly rough surface that helps the paint stick better. It’s kind of like how Velcro works – the rough side of the Velcro sticks to the soft side. So by sanding the primed surface, you’re making it easier for the paint to stick and stay put, which means your paint job will look better and last longer.
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