Do not use freeze spray on non-CC playfields. I did my T2 (diamond plate CC surface) and had no paint loss using freeze spray. I bought a cleopatra PF (no CC) to test various methods and freeze is very bad. Paint comes off all the time and mainly in little dots so your PF looks like an LCD screen with lots of dead pixels.

I tried heat and Shellite and had a little paint loss (I'm guessing Gavin may be right) and I did just heaps of shellite and slow peeling with probably the best result.

Freeze is great for DMD games as its quick but leaves all the glue.