Removing rear window; 66 Valiant

Valiant63 said

No way to save the gasket in case I need it?

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Maybe - if it is near perfect and soft, pliable, not too much nasty 'glue'... Certainly people do re-use gaskets, cause not every one is reproduced. Installing glass can have enough difficulties without dealing with old gaskets. But it will save you a Benjamin...
If you want to try - Use a putty knife or similar to loosen the seal from over the glass first instead of cutting lip as said before -then go inside and push glass should start to pull out of seal. If too much glue for glass to release, it's probably not worth risking glass break to save the seal. Can try to work some windex or soapy water in there as lube for the glass to slide out. Don't want to tear the seal. I rounded the corners on a small metal putty knife and fine sanded so no burs scratch glass or cut seals. Also have a set of yellow plastic trim tools from HF that were a great help removing/ installing my glass. I highly recommend NOT using screwdrivers! I even sanded/smoothed the corners off my plastics when seal started to tear stretching over lower corner of my front glass. In or out heat will help. Cold gaskets are not flexible... Good Luck!