If the base has been on it less than 24 hrs. you can probably clear it without sanding. Check manufacturers product sheet.
If it's a metallic base and you decide to sand it, wet sand with 800 and apply a couple more coats of base before clearing it. Otherwise the sanding will mess up the metallic and it WILL look bad when the clear goes over it. If it's non-metallic you can sand it and clear it, so long as you don't cut through.
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