Should I paint all four pieces separately or assembled?

Paint each piece separately before final assembly. This ensures even color coverage, prevents overspray on fitment points, and makes touch-ups easier down the line. Mask off mounting surfaces on each panel before priming and painting.

Do I need gap filler or seam tape between the panels?

Check your panel gaps after dry-fitting. Minor gaps at seams can be sealed with flexible polyurethane seam sealer applied before final paint. Some builders prefer to gap-seal after painting for a cleaner finished look — either approach works depending on your fitment and finish preference.

Will I need to drill new mounting holes or can I use existing ones?

This depends on your vehicle's current bodywork condition and the mounting point design of each panel. Before drilling, reference your OEM body panel structure and test-fit each piece to identify where fasteners are needed. Use existing holes where possible, and drill carefully to avoid damaging the FRP.