1. Copper Crimp Sleeves, 18-10ga.
2. Paint the inside brown. A Q-tip is perfect as a brush, just insert and turn it around.
3. A pencil makes a good painting handle. Insert it with the flange toward the pencil point, so you can just tip it off the pencil after painting.
4. Paint it up. Craft store acrylic paint goes on nicely and dries to a flat finish. An initial white coat followed by color top and bottom bands will give the impression of a ridged drum. Here I am using a "lip liner" disposable cosmetics brush (source).
5. Touch the top rim with the brown Q-tip to cover any shiny copper remaining on the edge.
6. Drums in place on the loading dock.
Now I had some open drums. I wanted to make some closed drums. I tried several things, but best results were with auto body spot putty. Goop some in and let it harden. It may need some light sanding. It settles and shrinks slightly as it dries, creating a nice "rim" around the top.
The final product, seen here in between some (LED Christmas light) gas cylinders and (sewing bobbin) cable spools.
At 100 drums for $8, you can create your own hazardous waste site in no time!