Both good products.

M20 is a light cleaner wax. It leaves a glossy, slick, and durable finish. Apply a single coat or top it with a synthetic sealant or carnauba wax of your choice. Very easy to apply and remove.

M21 is a pure synthetic sealant. It leaves a nice reflective finish. Its look is similar to NXT, but some users think it is more durable. It can also be applied with a rotary polisher.

 

could i use #20 then use #21, and then top it off with p21s?

 

Sure, if you want.

 

i mean is that the correct order i use them in?

 

Yep.