Do I need to paint each piece separately, or can I assemble first?

Paint each panel individually before assembly. This gives you cleaner edges, easier masking, and better coverage on seams and crevices. Once cured, you can mount everything to the vehicle.

Will I need filler or seam tape between the bumper covers and the factory body?

Check the fit at each mounting point before finalizing. Small gaps can be sealed with flexible polyurethane filler during final assembly. Body-line gaps often disappear once panels are torqued down to spec.

How should I prep FRP before painting?

Sand the entire surface with medium-grit sandpaper to break the gelcoat and improve adhesion. Wipe down with a tack cloth to remove dust, then apply your primer, base coat, and clear according to your paint system's instructions.