Go to your local PPG paint supplier that supplies body shops with their supplies. Ask where the distributor is at any good body shop. That's what I did in the last month. I have no experience with water based paints but have done a bunch of custom lacquer work over the years for fun. I had yellow mixed up for our 2005 Roadster. Got about a 2 oz bottle of touch up with a nail polish style applicator brush, half a pint, thinned by them, to spray in my airbrush, some high fill proper primer, and some buff-able clear topcoat. Have done some basic touch up work so far with the brush to get an idea of what I am working with, perfect match, should color sand perfectly. My local guy charges $15-$20 per item. Worth every penny for the right stuff it was PPG paint which painted our cars. This is basically fresh factory touch up stuff. Looking forward to the full airbrush touch ups over the winter.

Maybe they can mix up the windshield frame color and give you the proper products. They just needed my VIN. I haven't asked my guy about the silver yet, but I have some good size stone chips in our frame which should be repaired.. I think a rattle can of silver and a can of clear topcoat should get the job done. Dry or wet sand it with 1000 paper, that's what the shops do.

I used to build scale radio control flying model planes. Done lots of rattle can paint jobs that last through fuel, bugs and lots of cleaning.