I would suggest trying to remove it as soon as possible. Let us know what the results are - never heard of this happening to anybody before personally. Not just Klasse but anything.
By "remove it" I mean buff the SG as you normally do, maybe using a little spritz of distilled water to help.
I wouldn't be concerned, just a long as the residue buffs off. I really don't think there would be any detrimental effects to your car if it were left on overnight and the temp dropped below 32, as KSG is a sealeant and its MUCH more durable, and tolerates higher (and lower) temperatures better than conventional waxes.
I feel that if it was dry no adverse chemical changes would take place from the cold temps. But I do wonder if dew could have formed under it, in it , on top of it and what effect that would have?
Hello from a lurker,
I have been enjoying looking at all the shiny cars and learning what to do for mine. I really like the history of Classic Motoring Accessories, and PAC is just a great resource. I am looking forward to learning more, and will try to post some pics of my car, after I do a little more shining.