Never heard of it, but looks like you don't need much of it and carnauba is definitely a tried and tested product in car waxes.
"Malm's liquid contains only the finest blends of Carnauba and is very concentrated. You only need a tiny amount to give you all the protection you need! We recommend putting just four or five drops onto a damp sponge or cloth applicator. This should cover about 4 square feet."
Doesn't look too expensive either. Interested to hear how you find it.