(Issue resolved, thanks to everyone for excellent suggestions)
My car is about a month out so I'm practicing with my new Klasse Sealant Glaze on my wife's black Volvo when she's not looking.
I keep getting light streaky marks left behind that can only be removed with serious elbow grease & buffing cloth.

They're not swirl-scratches, something is being left behind by the sealant in an irregular pattern.
Is this normal? Or am I perhaps using too much or too little KSG, or buffing it the wrong way? Not shaking the bottle enough? Any ideas would be very helpful. Also, in your experience, for new cars is Klasse Sealant Glaze sufficient or is it really meant to be used after the Klasse All-in-one? We have K-AIO but the wife freaks when I use it because she insists it's abrasive. Thanks!
--doug