They had an excellent price and a free shipping promotion as well. I made a mistake in that I only bought the 2 quart kit. Buying 4 quarts would have given me some left over, which is fine. As it is now I don't quite have enough to finish, and I've still got more luan to put on the exterior, so I'll be ordering more soon.
You can see in this photo where I unscrewed the fan to get some sealant on the wood underneath. I would imagine that's a sure spot for a leak.
The stuff went on fairly easily. It's fairly thin, but it soaks right into the wood, as well as a roller if you choose to use one. I did.