I just rebedded one of ours.
When the factory installed them, they used double-sided foam tape. Clearly not the ideal bedding material. Now here comes the kicker: Because the initial bedding was not the greatest, owners often "fixed" the problem by injecting various substances to prevent leaks. We were lucky - my PO used silicon caulk. I have heard of people using 5200.
In my case (1980), it was definitely a 2-person job. having got the putty knife around the outside bezel, a buddy pushed form the inside. I could then cut off more of the caulking from the outside; in a couple of places I was inside, scraping and loosening inside. I also had a very fine-bladed metal "pry bar" (about 6" long in total), which I used to gently help prying the frame out. It took a while, but eventually it popped out. So persevere....gently!
One other tip: I removed all the silicon/tape, cleaned, decided to fill the void between the cabin top and liner with thickened epoxy, etc. Readt for the refit - easy, right? But made a total hash of reassembling the glass into the frame. Got the Dow-Corning 795 everywhere! Too little, it leaks...too much=big mess! But the cleanup was not bad; mineral spirits worked wonders, and closer to the gasket I used a plastic "chisel" sold by West Marine for mixing epoxy.
Why the mess? What I also learned:
- The glass (port fwd) is not totally symmetrical. Mark it before you disassemble! You should have seen me and my buddy flipping and reversing gooey glass until the got it right, so the frame would close. What threw me is that the tempered glass is outside and upside down on mine...no it didn't work the other way
- The two frame pieces could not be closed manually. Well, not by us, anyway. The tight new gasket, plus the 795, makes for a gratifyingly snug fit. I ended up using two clamps and their very gentle pressure to bring the halves together, which turned out painless and worked well. Luckily I had clamps to hand.
Finally, FWIW, I did not use the caulking supplied by Catalina Direct (actually, I did not use the decorative plastic liner either, as it would not match the other windows). I have been using butyl tape in a number of places, and am pleased with the results so far.
Some useful reference sites:
http://www.pbase.com/mainecruising/butyl_tapehttp://www.sailingseadragon.com/Ports.htm (second half)
Good luck! It's a good feeling when it is done, and the old girl stays dry....