Hello. I have just purchased a new teak dining table. I am concerned about stains from almost anything that one uses on a dining table, (e.g. water, cooking oil, coffee, wine, beer, various foods). The table appears to be finished with some oil finish, the description says "natural" finish. Teak is supposed to be very water repellent but I don't know about other liquids etc. My question is can I and should I put a protective layer on top? Family Handyman says use Watco Danish Oil but I don't think that will protect it as well as a polyurathane or varnish. I was inclined to use water based polyurathane but some articles I read said oil based is OK but not water based. Any suggestions or cautions?