Hello Don . Go to your local Airfield - not the toy one , and see who does B work - sheet metal repair to a/c . they will have all thickness's of high quality aluminum , you will pay more for it but it is worth the extra dollars . It will have a pure aluminum clading on it which will polish up to a mirror . Just make sure that you do it on a clean surface and put paper over the roller . It should come with a premask paper coating on it , which you peel off when your done . You should be able to get in 15 or 20 thou thickness . Scuff the part where you have the seam with scotch brite , wipe clean with acetone , use jb weld and you will have a nice bonded tube . Make sure you use some masking tape just outside the seam , in side and out , so you can wipe off the excess and not make a mess to the rest of the aluminum . Hope this helps , Geoff . 
