On my Post #14 I refer to the GCP being hard and not flexible and installing some scratches, and on the opening thread I explain that I did most of the work with the GPP. Although I had to do 5 passes with the GPP I feel that it's the best pad to work on Glass.
The problem is that I barely managed to finish my windshield before it got delaminated and that they are discontinued. (maybe this could be the reason why).
I also tried a LC HT Cyan pad and and in my case it left some haze, but I think it would be your best alternative if you cannot find a GPP.
Or wait for the new pad that Mike is referring to.
Just my brief advice and comments since I posted this review to begin with.
Please also read the extensive review that Corey (CEEDOG) has posted on Ceriglass. A ton of info there.
Theo.
PS. excuse my poor English. English is not my mother language.