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It really just smooths the air/water flow over the window edges and keeps water from getting forced in through a weak spot in the sealant for the window if there are any. Just makes it look cleaner.
 
When I was wrenching, we used this 3m stuff known as "Gorilla Snot". IIRC, it comes in black and yellow, will stick till the D falls apart and dries very hard? so don't get it on anything you don't want it on. Silicone would be much more forgiving.
 
Before it dries, a good solvent. After it dries, a grinder.
 
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