[jb92563]

I use Turtle Black Box myself which is a 96% pure black carnauba wax system with 4% silicone. The Black wax fills in scratches and does not turn white on curing, remaining black, hence the scratch/stone chip filling ability.

It lasts about 2 months before needing rewax but you can stretch that to 3 if you use the detailer spray after washes.

I researched the P21s vs S100 wax and it seems that the P21S uses a White Carnauba wax which is optically superior in its finish but softer and does not last as long as the harder yellowish S100 Carnauba wax.

Also the P21S has Bee's wax mixed in to make it soft and easy to apply, so its not 100% pure Carnauba.

I'd think that a red car would be OK with the yellowish S100 wax but none of the other colored cars would look good with that very slight color offset.