Question on the differences between clear coats

So the automotive clear coat that is offered in the store is a 2.1, although on beat for half the price I can get a 4.1. This is the only difference I can see between them. Seeing that I have no idea what that really means to the look of the final product I came to the forums to see what everyone else thinks. It shouldn't make much deference in the metalizing effect from what I can tell. Any advise you guy could render would be great.


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