Hi Po, The plastic tracks are basically made to cover the edge of 1/4" material, be it glass, plastic, or wood. It is more of a decorative finish touch for fixed material. It will not allow the glass to slide. I actually bought a piece of it because I thought it might work, but I was wrong. I still have it if you want it. 3M 4200 and 3M 5200 are adhesive/sealants. The key word being adhesive. If you use an adhesive to bed your window frame to the cabin wall, you will not be able to remove that frame again without extensive damage to the cabin wall because the fiberglass covering will give before the adhesive will. Don't think that you will never have to remove the frame again because you might. What if the window breaks and needs replacement next year? What if the fixed window breaks? Never say never. If you use a bedding compound the frame will come away from the cabin wall without damage. I made the mistake of using 3M 5200 to bed the dinghy chocks to the aft cabin top. When I tried to remove the dinghy chocks to refinish them over the winter, part of the fiberglass on the aft cabin top came with them when I pulled them off. Then I had to repair the aft cabin top. If I had used a bedding compound, the screw penetrations through the aft cabin top would have been watertight, and I would have been able to remove the dinghy chocks easily. Again, you don't need an adhesive for this job, you need a bedding compound to make things waterproof. Dolphinite is like a thin putty. It spreads easily with a putty knife, and is easy to clean up. If you read the can you will see that it is used on wood hulls between the planking, and at the keel to help make them watertight. Must be good stuff! I have a winter canvas cover for the boat made by Fisher Canvas that completely covers the boat from rub rail to rub rail. It has zippered doors at the port and starboard boarding gates, and the cover allows you to board the boat, walk around on the decks, and get into the cabin spaces. You can even get on the flybridge, but the headroom is quite limited. So, the entire boat is enclosed, and I was able to remove the window without weather consequences. This cover is really a great luxury if you want to work on the boat in the off season, which I do! The cover is custom made for my boat. I am sure that they would have a pattern for your boat. If you ever consider getting a cover, then you should look into Fisher Canvas Covers. The cover also saves me a grand a year because I don't need a covered slip! BTW, I have no financial interests in any of these products. Usual disclaimers. Hope this helps, glad to be of assistance. Andy Andy & Linda Woods Grand Folly 1970 Grand Banks 36 Classic Georgetown, MD. ajwoods@worldnet.att.net -----Original Message----- From: Po Chang <pochang@rocketmail.com> To: Andrew Woods <ajwoods@worldnet.att.net> Date: Tuesday, April 25, 2000 9:25 AM Subject: Window Leak Repair >Thanks Andrew, > >Good thing you told me not to use the plastic tracks by Beckson. I >was seriously considering those over the stainless tracks. Why you >say the plastic ones are useless? > >I just have never used Dolphinite. Some people suggested to use >something like 3M 4200. Any opinion on that? > >Did you work in a covered dock? I need to make a tarp over the area >during the repair to keep the rain out. > >Po