Zaino Store
The first application seems a little intimidating when you read the writeup, but after that they're very easy to use. They seem expensive, but since you use very little per application they're a pretty good value. These are probably the longest lasting products I've used or heard of.
I'd recommend starting with:
Z-2 or Z-5 (Z-5 is for darker colors or swirled paint, Z-2 brings out more shine in lighter colors or defect-free paint.)
Z-8 (Best Zaino product. That's not my opinion, it's a fact.)
ZFX (Curing accelerator. Necessary for the first coat unless you use Z-AIO. Helps follow-on coats last longer.)
IIRC these pictures are 1 coat of Z-AIO and 1 coat of Z-5 topped with Z-8 over freshly polished paint:
