BEWARE OF OIL-BASED PRODUCTSGolden Care products are water-based. Water transports active ingredients into the hardwood, then the water evaporates, leaving the wood residue-free. Oil-based products are for indoor woods only. In teak and other hardwoods, the oil seeps into cracks and does not evaporate, resulting in mold and mildew. The results from Golden Care products last 3-4 times longer. The world's top teak and hardwood manufacturers use Golden Care products in their factories. Treat and protect your hardwood furniture with the best. The Whitener also protects the wood against moisture and adhesion of dirt and prevents mildew growth. Golden Care Teak and Hardwood Whitener also slows down the weathering process. After ageing, your teak will weather to a natural white, silver grey instead of turning dark grey or green.