I used the tutorial above as well but good luck finding that gun or any other 80 watt gun for that matter. I looked at home depot, lowes, micheals, harbor freight, ace hardware, jo annes, sears, and walmart. They all topped out at 60 watts if even that. I ended up finding this site
Ad-Tech Glue Guns at Welcome to Hot Melt Direct
and I got the AdTech HD 200 it's 200 watts and cost me a about $45 shipped. Then I got a 1/4" OD copper tubing and a 90 degree compression fitting coming out the side of the gun into anothe 90 degree fitting to the input it pointing to the back of the gun and then a on off valve with a quick release air fitting. The fit was pretty tight but I got it back together I need to find some sort of stap to keep the on/off valve from swiveling but other than that it seems great. I have not had much of a chance use it yet but from my short testing it seems awesome.
With all that being said I still ended up spending about $60 on the project and you could but the low end minionsweb.com web gun for that same price an if you lived in a warmer area of the country it would probably do a fine job for you. But if you want more power or are just a diy fan like myself then I think the above glue gun is the way to go could not find a better/cheaper one around, most 80 watts you can find online will run 25-35 shipped so for the extra $10 you are getting double the power.
If anybody really wants pics I could probably get some up before halloween otherwise I will probably post my step by step after halloween.