If done properly, only the primer needs sanding. Apply 2-3 coats of color and then 3 coats of clear. If it's a lacquer or urethane, wet sanding can be done the next day. Modern buffing compounds require 1500-2500 grit as the final grit before buffing. 800-1000 grit only needed on large surfaces or heavy orange peel texture.
Urethane or epoxy primers will adhere to a properly scuffed carbon fork. If clear coated, that paint should be urethane. Primers for plastic are usually appropriate only for single stage paint.
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