Yes, you do install from the inside. Here's what I ended up doing. First pull out the old rubber gasket CAREFULLY, and remove the screen. Then get some of the black screen from Lowe's and cut it to the exact size of the window. Next, get some Crazy glue or something that dries very fast, and just tack the screen into place with a couple dabs of crazy glue, just enough so the screen stays put if you let go of it. Then I got some silicone seal, and put one very fine bead around the inside edges of the window and outer edge of the replacement screen, and pressed the old rubber gasket onto the silicone. If you are really careful and neat putting down the silicone bead and don't slop any on to the outer part of the gasket, you can close the window and let the silicone dry. Next day, open the window, it's fixed. Took about an hour to do both windows in my cuddy. Not including the trip to Lowes and going to Happy Hours on the way home, then sampling the whole six of Heineken. Forget about using 4200 or 5200, you'll want something that comes off easily. You're not diving your boat to 500 feet, so don't worry about a little water from the washdown getting onto the silicone.
