That depends on the cab. What is it? If need be, we can always come up with spare windsheilds. I've put the "Glass" in the purple stuff and have been ok. But, it's better if you let the chemical do all the work of removing paint and glue. I imagine it's an AMT kit? Usually, the tub glues to the bottom of the widshield or door glass. Kits like the Mack R or any of the White Motors kits(Autocar, Diamond Reo, etc) are one piece of glass for the whole cab. Your tub will have more to grab onto if that is the case.
It will weaken glue joints, but depending on how much glue is there, and how it was built, some joints just won't separate. Example:
My Mack R model's front bumper. I was going to restore this truck with only minor mods. However, for a 17 yr old glue joint, I just could not get the bumper to separate from the right frame rail. So, I chopped it down. The glue I used was what any 13 yr old would use(at least in 1991):The good old Testors in the red tube. I didn't use 1/2 a tube, but I did always scrape chrome and paint from mating surfaces.
It didn't give me much trouble as far as disassembly. Bear in mind that you may have to soak it, work it, then soak it again with many joints. I have to do that with a lot of my used parts that I buy. Also, you will always have the part the cracks or even breaks, so be prepared to repair or replace smaller, or thinner parts.
I know there are better ways to explain it all, but at least it was a start.