Bonnie, I would think twice before permanently installing those windows with 5200. If something should happen to cause your window to shatter, I think you will have to take the window out to get the glass replaced. 5200 will tear your wall up when you try to remove the window. (Granted, you are an expert with foam and foam repairs....) 5200 sticks so well that will even tear up wood. (I've heard that 4200 is not as bad; but, I have had no personal experience with 4200.)
Also, after my windows had been in for four years, the windows, themselves, started to leak in heavy rain storms. It seems that the weather stripping used in the windows weakens and flattens too much over time. (The windows that I purchased may have been in the store for quite a while, too.) To remedy the problem, I left the existing weather stripping in place but added a strip of:
black md all purpose silicone gasket (68668 WS108) 1/4"Hx1/2"W
I added the gasket material to the sides and bottom opposite/facing the original weather stripping. That seems to have done the trick.