I did it exactly as shown on the Sportsman 2 plus 2 window install video. You will notice that in this video he has you apply a base layer and let’s it dry. You do not just lay down a single thin coat and install. You need to follow the steps in that video. I recommend watching this video a couple times and taking written notes so you have a quick reference when doing the install. Silpruf is silicone. It is 100 percent UV resistant. The negative is you do not want it to get on anything that is going to be painted or you risk getting fish eyes. Be very diligent in taping and protecting unpainted surfaces. Silpruf is offered in grey and black, so decide on color. It is expiration date sensitive so make sure you get fresh stock and not something near the expiration date. I did the install almost 5 years ago (using about 3 tubes). I flew the plane for over a year without the joggle filled (Joggle gets filled in after the plane is painted). The plane is outside most of the time while traveling. And zero issues. Finally, if you ever need to remove and replace a window, it much simpler and no cutting of fiberglass is required.