There are tons of threads on this and I haven't found anything definitive to convince my either way. So I decided to email s100. Here are my email exchanges:
------------------
ME: Hi, can I use my S100 Carnauba wax on my car? Is there any difference between my S100 and P21S wax?
S100 Customer Service: Dear Sir, There are indeed chemical differences between the two formulations, but you may use them interchangeably, bikes vs. cars.
ME: Thank you. Can you please highlight the differences between the two?
S100 Customer Service: Dear Sir, We really cannot as this gets into ingredients details which are considered to be a trade secret.
ME: I completely understand not revealing any trade secrets and I wouldn't expect you to. Frankly, listing differences in ingredients wouldn't be any help to me as I wouldn't understand what different chemicals do. I'm looking for differences in characteristics that make s100 more suitable for a bike and what characteristics that make p21s more suitable for a car. As I understand, there is no difference in paint used on a car versus paint used on a bike so I'm quite confused. Please enlighten me in layman's terms without giving away any trade secrets.
S100 Customer Service: The formulas differ a bit to account for the fact that a bike's surface is smaller than a car's. We really cannot go much further without getting into confidential areas. From a practical standpoint, we do not think you would see a big difference if you used the products interchangeably.
------------------
In my opinion, the s100 company's response is not overly convincing. Wax formulated for the size of the surface it's going on to? Sounds pretty hocus-pocus to me but what do I know.
Anyways, even if there is a difference, I doubt the P21S is twice as good.
------------------
ME: Hi, can I use my S100 Carnauba wax on my car? Is there any difference between my S100 and P21S wax?
S100 Customer Service: Dear Sir, There are indeed chemical differences between the two formulations, but you may use them interchangeably, bikes vs. cars.
ME: Thank you. Can you please highlight the differences between the two?
S100 Customer Service: Dear Sir, We really cannot as this gets into ingredients details which are considered to be a trade secret.
ME: I completely understand not revealing any trade secrets and I wouldn't expect you to. Frankly, listing differences in ingredients wouldn't be any help to me as I wouldn't understand what different chemicals do. I'm looking for differences in characteristics that make s100 more suitable for a bike and what characteristics that make p21s more suitable for a car. As I understand, there is no difference in paint used on a car versus paint used on a bike so I'm quite confused. Please enlighten me in layman's terms without giving away any trade secrets.
S100 Customer Service: The formulas differ a bit to account for the fact that a bike's surface is smaller than a car's. We really cannot go much further without getting into confidential areas. From a practical standpoint, we do not think you would see a big difference if you used the products interchangeably.
------------------
In my opinion, the s100 company's response is not overly convincing. Wax formulated for the size of the surface it's going on to? Sounds pretty hocus-pocus to me but what do I know.
Anyways, even if there is a difference, I doubt the P21S is twice as good.