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Re: Can someone tell me whats this is from?
If your metalwork involved grinding, the grinding disc heats up the metal fragments which become hot, flying particles. The hot particles then come in contact with the epoxy primer and some are hot enough to melt their way through the primer and come in contact with the metal base. Some are just loose metal particles that rust.
If it were me, I would just scuff it and shoot it when ready. As long as you don't leave it exposed to the elements, it will be ok till you do so.
Always take the time to blow off surfaces once you grind anywhere around them.
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