Don't paint it! Teak has an oil content and paints don't adhere well. There are treatments that will keep it the nice honey color. Found this info; scroll down to question 14 and on down.

Here is a link that might be useful: Teak furniture

rain, are you sure you can't paint them? I don't paint or stain mine but I know they varnish the teak that's used on boats. Is there a difference? Billie

If you like the golden honey glow of well-oiled teak, there's a product called Teaqua that you might want to consider. We have a lot of teak furniture both outdoors and indoors and wanted something easy to use. We heard about Teaqua last year from several boat-owners and tried it on all our outdoor teak furniture. It goes on real easily, and one treatment was enough for the whole year. We ordered some more for this year's application since we were so pleased with the results.

Just took a quick look at the Teaqua, and it looks good.
Was wondering what color it would give an old silvered teak? I also have a 10yr old brown couch frame...Does it just provide the oil or a protective coat as well? TIA

TeaQua Oil, Pigment, and Sealer: Protects,restores, and enhances the natural glow of Teak.

The magazine reviews are positive "If you prefer a more natural look, teak oils are the way to go. We are particularly fond of pigmented oils because they disguise the sun damage and bring "bleached bones" back to a rich luster, while retaining the nonslip surface that raw wood provides. Our team recently tested TeaQua (teaqua.com) on our project boat with great results. Not only does it contain natural colored pigments, but its penetrating formula, according to the manufacturer, has a sealer too."

Sounds like the perfect solution. Thanks for the tip Mamimo