I applied a one-step porcelain coating to Mrs. Peel. It's Aero Flight Shield, it's only $29.99 for a small bottle, and a typical consumer can use it if the prep work is properly done.
The paint surface is like a mirror, now. Look at the right rear fender in the photo and focus on the reflection of the trees. It works very well. And Mrs. Peel is impressively shiny now.