It is unlikely that painting a shower door frame would stick for any length of time.
I changed my mind last minute and decided on the nickel finish, the gold looked a little too faux, instead of the aged brass I was hoping for. I combined parts of two tutorials, I chose to use the same Rustoleum product that Sherry from Young House Love used on all her hardware, she had great results, it's been over a year and they still look perfect.
I used the procedure for the shower enclosure (removing caulk and taping) that Kristy at Addicted 2 Decorating shared on her redo.
Sand all surfaces well, I started out using 220 grit sandpaper, and ended up using 150 grit, because it was faster and Sherry said you don't see any scratches after you paint.
Use a very fine grit sand paper and lightly sand all of the surfaces of the trim. Your ghetto rig job should look something like this: (Don’t judge me based on my garage right now.
We are in the middle of re-doing our entire house … This is our workshop for now.) Superman took fishing line (you can use very thin string as well) and tied several pieces back and forth across 4 boards in the garage.