I've bought Meguiar's Endurance at Pep Boys. It works well, however if you let it sit for about a month without reapplying, the cladding get's dull, with streaking at the cladding screws.

Discovered this while out on vacation (truck was in the carport, but I drove it through rain a few days before washing).

Once I reapplied, it was good as new and the shine lasts a long time (I've got three weeks and it still looked great).

-- John