Hi,

I'll be making some CF wheel arches for my Caterham shortly and would like your recommendations as to a durable (lots of travel will hit them) resin. The arches will remain unpainted and the process I will use is vacuum infusion.

Ta in advance :-)

Thought so.
Are you worried  about spider cracks? That won't  happen with woven fabric and infused parts. These defects are caused by the thick gelcoat, and the low stiffness of chopped mat reinforced composites.