Repainting black alloy/aluminium window strips

Hi. Has anyone tried to do this please? My door key surrounds also need painting but not sure how to do it without making it look worse. Thanks John 

Are you married to painting them? My cars are missing these pieces, so I've tried to educate myself about them since I really don't want chrome pieces on the car, which I've seen occasionally. My concern with paint is that you'd have to make sure it's only on the outside of the parts since, if it gets onto the gripping bits, it may compromise the holding of the parts to the window.

Have you looked into getting the parts anodized? I think that was the original finish.

Good luck

If you can remove the parts (not that hard to do), spray them with SEM satin black trim paint.

Late but...

In the past I've had very good results using clear packing tape for a 'mask' on the doorlock surround.  Stretch a couple pieces over the lock still mounted.  Carefully cut the tape around the lock cylinder with a new small razor knife, and cut again in the middle around the lock itself. On the outside, I cut between the bezel and the rubber gasket.  Carefully pull off the donut section, leaving tape on the paint around the bezel and in the center to mask the lock itself. Press the edges of the tape tight against the car at the edges so no bleeding. Then a very cheap plastic masking film or drop-cloth gets a small hole cut to fit around the bezel and cover the rest of the car while you spray. Regular masking tape for the fit around the tape surrounding the bezel.  It takes longer to type this than the whole prep.

I wipe the lock bezel out with rubbing alcohol, then a scuff with a fine ScotchBrite pad, and another wipe with alcohol.  Let it dry.  Then a couple thin coats of SEM trim paint.  Shortly after the last spray coat, pull the masking off carefully, and it won't risk lifting your new paint.

I've used Rust-Oleum satin black spray in a pinch.

The window trim can be done in a similar manner, but takes a lot more prep.  The mirror gets unbolted, bagged, and taped to the side of the car so it's out of the way.  The prep is more critical and must be even all the way around.  I like the scotch-Brite pads for surface prep from simple wear, but it does little for scratches and chips.  The clear packing tape gets the nod again, since it cuts easily around the trim and makes a really clean edge. Paint just the metal, not the rubber wiper edge or the felt.  Cover the whole rest of the car with painters film while you spray.