Do I need to apply clear coat or can I leave the carbon exposed?

Bare carbon fiber will yellow and degrade under UV exposure. A clear coat or protective UV-rated topcoat is recommended to maintain the finish and preserve the weave texture long-term. Sand the surface lightly and apply your chosen topcoat after fitment.

How do I seal the edges where the over fenders meet the factory panel?

The edges should be sealed before or after painting to prevent moisture infiltration. A flexible polyurethane or silicone-based trim sealant works well for this purpose. Apply it after your finish is dry and you've confirmed fitment and gap alignment.

Will the carbon fiber edges stay protected if I don't seal them?

Unsealed edges will absorb moisture and can develop separation or delamination over time, especially in wet climates. Sealing edges is a one-time step during installation that prevents long-term damage and keeps the fenders looking sharp.