What is the best way to paint on both Pewter and toy plastic?

What is the best approach to painting both of these with white all around and blue in the middle?

My tools are: primer, white and blue spray paints, or blue acrylic model paint.

Should I use primer on everything first or can I spray directly on the pewter and maintain consistency. Should I spray my blue on the white paint directly or should I mask it off and use primer again, then the blue? Would acrylic run on bare plastic?

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