Raft bond too strong

[EagleSeven]

Questions:
1. Is the glass bed approach just ordinary window glass on top of the bed? Is it taped to the bed to hold it in place? How does it affect the heat setting for the print bed?
2. I am using PLA exclusively right now, and just blue tape on the bed. Is there a heat setting for the bed temperature that allows me to dispense with rafts?
3. I am having problems separating the raft from my print. Is it possible that I am printing at too high a temperature, thus causing the raft to fuse with the print too strongly?

Thanks

We used window glass purchased at Lowes-hardware.
Used Aqua-net spray to stick glass directly to aluminum plate, No tape
Use large paper-clips to hold it in place until dry, takes about a week to dry completely
Top of glass is about 15 C lower than indicated temp

Since adding glass, we do rafts only when large Support areas are needed,
for objects with overhang areas at bottom of object.
Use Aqua-net spray to hold printed objects to glass also, thin even coat is best.
(wash off spray, with wet cloth, after each print)