I need to know the best way, efficiant and proper, to refinish teak furniture. This particular furniture sits outside in New Jersey fro april to september in direct sunlight and becomes a grayish color. Each year we sand the surface lightly, but it never actually resembles the original color. I can only get the large areas, even with profile sanders. Is there any other method than sanding that can be used. I have about 40 peices of teak and it takes about 200 man hours to sand it all. Please respond with some helpful hints.