WeatherCatPad (WeatherCat for the iPad) version 2.3 is now available for download from the Apple App Store
I think "Good Stuff" would probably be better, I just wish they made it in much smaller cans. I usually need a table spoon of it somewhere every two years, but once it starts coming out, anything still in that long tube dries out and you're stuck (no pun intended, of course) with 90% of the contents forever unavailable!
"Good Stuff" is the cheaper brand of "Great Stuff"; it's just not as... uhmn... good. Similar to Windows and Mac...
On my first go, I did not seal my pipe with silicone. Water drizzled into the pipe over several winters, eventually accumulated enough to freeze and break the wire. So don't do what I did. Be smarter than that.