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Also, it is to add "grit"/"grip" to a smooth surface, so paint will adhere. That is the case on most metals. On most plastics, oils from manufacturing is also an issue.
For textured plastics, soap, water, and alcohol are plenty. On polished metals or smooth plastics, something needs to be done to the surface to give something for the paint to latch on to.
For textured plastics, soap, water, and alcohol are plenty. On polished metals or smooth plastics, something needs to be done to the surface to give something for the paint to latch on to.