I'm looking for a way to repaint a fender but it has to look aged to match the rest of the car. I don't want to do a total repaint.
What do your other fenders look like? Dull? chipped? Alligatored/crazed finish? Fairly easy to "patinize" a surface if you experiment. Scotch brite pads, steel wool, gun-browning solution, primer showing through the paint, etc. Just about any look can be achieved. When I go down to the nostalga drags at Bakersfield every year, I am always impressed by the "aging" done by the young tattooed and peirced crowd to their "postwar" style hotrods. These are Ford T's and A's that have been built "circa 1950" and actually LOOK like they were built and painted 60 years ago. Faded paint, lettering going away, etc. You'd never know the car was built and painted last month. Check out some Rat Rod websites or flatheat websites for some clues. Pretty interesting stuff.
PPG makes a flattening agent to add to your paint. Ask for a product sheet from your supplier.
You'll have to play with it a bit but you should be able to get a not so shiney look from it.
Ask Dan Killecut ("Barn Fresh 1913" thread) how he did his '14 touring. It fooled a well-known expert into thinking it was all original.