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Your picture makes it look fairly smooth already. A light texture is fine for a basecoat of metallic, unless the bumps you mention are more like pieces of dirt in the paint.
Modern pearls/metallics are meant to be clearcoated and do not do well when wetsanded and polished w/o being clearcoated (sorry GTMike).
If the surface is relatively uniform w/a light texture, you can either lightly sand it and then apply another coat of blue, or simply clearcoat over the blue, and polish that to a smooth shine. The clear will smooth the surface somewhat, but for best results you always need to wetsand/polish the clear.
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