I questioned the manufacturer about the finish and what could be done to preserve and restore it. They have refused to provide any information siting, "we do not test out products with Chemical treatment" they then add that, "We tend to use natural, dye-free stain on our wood products". I have repeated asked if it is oil or water based and they refuse to answer. The do pivot to trying to sell you covers... nice.. Hard to believe they don't know what is on the wood and what is best for preserving it. What company manufactures 1000's of a product without testing. This wood is known to degrade in the sun and the manufacturer refuses to assist in preserving the product. Stay Away!