Most of the fading problems are from no UV inhibitor in the gel-coat. You can rub and wax until you are blue in the face. It may look good for a month ot two but it will be back. The ONLY real cure is to have it painted. I had my front cap painted almost 3 years ago with a base coat clear coat process. Still looks good. Now my rear cap looks like dung. Having it painted this Spring. Shop around to some big truck repair refinish shops. Paid $1500. for the front but recently found a shop that will do the rear for $800.00. Have to have it done. Nobody will want to give anything for it the way it looks.
B.O.