Bryan...I've not used the DIY version,but I do use a repair kit in my work.
If you can, gently heat the windshield from the inside while applying the pressure from the injector. This will help the resin flow a bit better.
Also try and do it in shade as the resin cures with UV light. this will give you more working time.
I also apply pressure to flex the damage from the inside but it's a risk as too much can make the chip/crack worse!
Let us know how it turns out.
Jock


1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.