I've read about a lot of DIY upgrades here and many include application of canned foam. (e.g. Great Stuff) I thought I'd follow-up on my previous post in the DIY froum about my purchase and use of a multiple use foam applicator gun. http://www.hearth.com/talk/threads/spray-foam-gun-recommendation.73362/ This is the foam gun: http://www.acehardware.com/product/index.jsp?productId=2278950&cagpspn=pla I'm sure others work equally as well or better. I've used it now about 50 times over 1.5 years and its been great. As long as you keep a can of foam on it as the manufacturer recommends you don't have to clean it (despite the claims of many). You do have to keep the outside of the tip clean but that's easily done with a knife or a little acetone. I've used probably 6 cans of foam so far. Its much more controllable and very handy not to have to use a whole can of foam any time I need less than that. The cans seem to go a lot farther than the single use cans. Just yesterday I was installing a medicine cabinet in an outer wall, installed some XPS foam board to create a air-tight box in the wall before installing the cabinet and was able to use the foam gun to build and seal up the foam box very quickly.