Well, you'll find it at a flea market or yard sale, or in a friend's garage, so you should try it yourself.
On my friends back 4-Runner (before he called me), he did the Scratch Doctor polish and then the Nu-Finish--I Guess it is a sealant, or wax perhaps--it turned it into a leprous black with white blotches.
But even if that was a fluke, it isn't pretty, it doesn't feel effective, and it takes 2 apps to do the 6 months. If you are doing two apps, use a pretty wax like Natty's or Souveran or any of the more expensive OTC products, and enjoy a better result.
But I'm just one man.
You see, PEI is one of the most car-caustic places on the planet. A ten year old car with no rust is a car with significant body work, or owned by a detail geek, or is a garage queen. Our products have to be good.