When Rob from Gtechniq said some time back while testing you cant remove Crystal serum with any agressive product or polish compound , the only way is to wet sand it i did think "yer ok i'm sure" .
But he is total correct , i got many training panels that i use for the KDS pupils on their master courses, one of these has Crystal Serum on the surface.
This CS coated panel has been used for 4 pupils now and we spent around 1-2 hours per pupil learning how to use a rotary before moving onto another larger panel in a darker colour training panel.
Guess what its not touched the Crystal serum at all.
This means any slight mess up with application you in big trouble with the effected areas then needing wet sanding to remove prodcut.
I have also tried removing Crystal serum while its curing (which is very short time span) and even very strong solvents really struggle in fact we marred a test panel badly trying to remove it.
To date its the only product that KDS take many extra steps (ie setting up the area, lighting and equipment) for application.
So "pro" use only is there for a very good reason.
This is the first product thats actually got me thinking WOW,, anyone that knows me personally will know i am not someone who is impressed easily or gets excited, nor do i post words like WOW/Miracle/Amazing/incredible - this deserves it.