Aerosol containers are by far the best way to go. Easily weldable and very strong, can be purchased in a large variety of diameters and wall thicknesses / lengths. They can be acquired in rolled steel and even in some cases, aluminum. Mig welding works great for either...

I use "gunk" cans for large cannisters, and WD-40 for smaller ones. Since I use a lot of this stuff on my antique motorcycles, I always have empty cans laying around...


DP