Do I need clear coat on carbon fiber?

Yes. Clear coat protects the weave from UV exposure and yellowing over time. Sand the panel lightly and apply your chosen clear coat system to seal the finish and keep the weave looking fresh long-term.

How do I seal the edges so they don't fray or absorb moisture?

Sand the edges smooth, then apply epoxy resin or edge sealer along all cut and raw edges. This prevents delamination and water ingress, especially critical at panel gaps and mounting points where moisture can collect.

Will this yellow or discolor without protection?

Carbon fiber is resistant to discoloration, but UV rays will eventually dull the surface and darken the resin over months. Clear coat provides the shield — treat it like you would a paint job to maintain the original depth and gloss.