Does the exposed core after grooving or cutting require additional waterproofing or protection?

A: Yes, it is highly recommended. The exposed PE core is porous and susceptible to direct UV radiation. For outdoor applications, it is essential to fill and cover all exposed edges with color-matched specialty waterproof sealant or U-shaped protective cover strips after installation. This prevents moisture ingress (which can cause core swelling) and slows down UV degradation.