whilst on the subject of windscreen coatings
i applied Glaco something
when i get a film on the screen (more visible during early mornings in winter)
you could see squares over the entire windscreen
pics don't really show it, but you can just about make out some of the squares
when car is fully warmed up , in summer you cant see it at all
after how ever long, its now finally gone (even after the coating had weakened)
Had something similar last year when I first started using the AG three stage stuff. At the time I couldn't work out if it was the Snowfoam, Polar Wash or the Polar Seal causing it. So I started to deliberately keep the Polar Seal away from the windscreen and it reduced it considerably, although you can't help but get some running down off the roof onto the windscreen during application so now and again, it happens again albeit not on the same scale.
I ended up claying the windscreen and using the Glaco Cleaning Compound to get rid of the marks. As you say, they could make driving at night tricky particularly when the windscreen wipers swept over the glass so I was glad to see the back of them.
As I said earlier, I see loads of YT videos of various different spray on protector wax products being applied all over the car including the windscreen, and whilst it is nice to see rain beading off the glass at speed, they still to my mind have the potential to leave a film or streaks all over the windscreen. So these videos on YT of apparently 'professional' detailers spraying the stuff all over the place, puzzle me to an extent.
Anyhow, these were the marks I had (pictured in daylight, granted) - not to dissimilar to yours, minus the 'squares'.
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Not sure I’d bother getting anything else, as it’s just an inferior product. 
