I agreed to replace the scratched glass in a wood storm door panel for an old client, but have run into difficulty. The glass is very securely adhered to a rabbeted red cedar frame with what I suspect is polyurethane caulk. I expected silicone bedding which I have been able to dislodge in the past by driving in stacked single edge razor blades, but this stuff is not giving in to persuasion and I fear the wood frame will break. The glass is about 3/16" x 22" x 66" which leads me to believe it is laminated rather than tempered (I would expect tempered to be 1/8" thick). If it were tempered it could be broken into rubble and probably removed in fragments from the frame, but I am not at all sure about making that happen with laminated glass.
The scratch is minor in my opinion but the clients are house proud. I am tempted to tell them I can't do the work and their best bet is to live with it. I am pretty sure if they take it to a typical glass shop they will wind up destroying the frame. Any advice?