Ok, on my 73 convert, the previous owner had the driver window installed on a slant, therfore, whenever I rolled up my window, there was a gap where it met the top. I took the door panel off and saw the window was anchored into the window channel with butyl rubber, and reading in this newsgroup, it was said no solvent could remove it, just manual labor. Wel, I could not reach around to the back of the glass to scrape the rubber off/out of the channel with a utility knife ( the front was a real pain as it was, and I could not clear it all out anyway) so I had the great idea of melting the rubber or softening it up with a propane torch to pull out the glass - besides, I heard removing the whole window mechanism and installing it is a great ordeal - so my idea sounded better. SO I heated the channel, and the rubber suprisingly was becoming brittle, and was begining to be easy to pick out - then I heard a little "Kszh" sound and saw a dime size crack form in the window, just above the channel. "Oh no, this is going to creep! - this sucks!!!" I was quite mad at myself; which for some stupid reason did not stop me from heating it more anyway, I was really hating this butyl crap - and after a minute of heating I gave up. I settled back, and started cleaning up around me, then about 15 seconds later I turned away from the window I heard a loud PTSSH! and was showered by a bunch of little glass cubes. I looked back and my whole window seem to have exploded! Nothing was left, just a few pieces in the channel. I could not beleive it!! Different rates of cooling in the glass I guess. Stupid is, stupid does. Kids, don't try this at home. Don't try this ever. Admiting this, nobody will ever take my advice now Got some new glass - will be going in shortly.
Matt S.