Do I need to apply clear coat to these fenders?

Yes. Bare carbon fiber will yellow under UV exposure without protection. Apply a quality automotive clear coat after final fitment and sanding to preserve the weave and maintain color. This is standard practice for real carbon parts.

How should I seal the edges where the fenders meet the door and quarter panel?

Sand and prep the mounting surfaces, then apply a flexible sealant or trim seal along the overlap zones after bolting the fenders in place. This prevents moisture and debris from collecting in the gap and keeps the seam clean.

What surface prep is needed before clear coat?

Sand the carbon surface with fine-grit sandpaper and clean thoroughly to remove dust. Use a tack cloth or solvent wipe before applying clear coat. Proper prep ensures even coating and long-term adhesion.