If we are talking about only 4 tows intertwined, then with any resin system it will still be flexible to go around reasonable diameter curves due to the simple fact you have such a small amount of material.

If UV resistance is such a high priority then perhaps a UV stable polyester might be better. Polyesters are weaker and less stiff than epoxies in most cases, but as a bonding and waterproofing resin it would be fine, and the less stiffness means more flexibility which is what you want.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant