Cedar naturally resists moisture, rot and insects, so it's a classic for fences. It's easy to seal or stain. If left untreated, it weathers to a distinguished silvery gray. Western Red Cedar is more expensive but provides a more natural look with fewer imperfections. It should be treated with a clear seal to retain its red color. Redwood is naturally insect and rot resistant. It provides a beautiful and long-lasting fence surface and with its open-celled structure and contains little or no pitch or resins. This enables the wood to absorb and retain all types of finishes extremely well.