www.refinishwizard.com IIRC has this subject posted.

On Wed, 08 Dec 2004 02:06:50 GMT, wrote:

We have a dinning table set (6' X 3' table, 2-leaves, 6 chairs) that
is in excellent condition other than the dark stained finish has been
wearing off in spots over the years. I know that rattan doesn't take
kindly to finishes, but wondered if there's any product that I can
apply which could be feathered in? Markers don't work.

Mike