I haven't done this yet myself, but that Catalina kit is the right stuff. The kit is expensive though and you might be able to source the materials on your own for less. From what I've read on this, the vinyl glazing alone is not watertight; you must use the sealant too. Also from what I've read, this is a pretty fussy job and it is not unusual for it to take more than one try to get rid of all the leaks. -----Original Message----- From: Rob Bultman <rob.bultman@gmail.com> Sent: Saturday, March 27, 2021 12:33 PM To: For and about Montgomery Sailboats <montgomery_boats@mailman.xmission.com> Subject: M_Boats: Window Glazing Material Hello Folks, I have a leaky port window on my 1977 M17. These windows have the two-part aluminum frame with the exterior frame holding the "glass" and an inner frame which screws into the exterior frame from the inside, holding the window in place. I managed to get the window out of the hull and the "glass" out of the frame. The window glazing that holds the glass to the frame is very brittle and in one location completely gone. The exterior frame that holds the glass has a single cut in the frame that allowed the window to be removed with a little force applied to open frame. I'm looking for a replacement for the window glazing. Is there a recommended source for this? Would something like this work? https://www.amazon.com/Gray-Glazing-Vinyl-Glass-Thickness/dp/B00O8ZUM6K?th=1 I also saw this kit from Catalina. https://www.catalinadirect.com/shop-by-boat/catalina-25/hatches-ports/gasket... If the glazing is not a watertight seal and some sealant is still required, I don't know how I could seal it without making a huge mess, given that the window frame is a single piece with the one slit. At this point I'd like to retain the original aluminum frames and window, but I'm open to suggestions. I've seen the replacement project on Audasea on the photo site. I saw another (non-M boat) where spacers were used to push the window away from the outer edge and butyl caulk used as glazing and sealant in the space created by the spaces. (I think the spacers were temporary.) Thanks in advance for responses. Regards, Rob M17 FIN