Hello, and thanks for the info, it's good to know the copper won't disappear half-way through training. Janet; I discovered a type of scented geranium that is absolutely a dream to train. I believe it was 'lemon crispum' but you'll know it when you see it. It grows straight up with small ruffled leaves that look a bit like curly parsley attached almost directly onto the central stem. I recently found a lovely variegated type that is stunning mixed with the original green, especially. I just root them at the base of the form and tie them with raffia until they're wrapped about the form sufficiently to stay on their own.
Regular geraniums are a real effort to train because they have to be pinched back to be bushy. The best way I've found around this difficulty is to take a wire ring or chicken wire form made for holding spagnum moss (found mine in the crafts section). Then I rooted bunches of the cuttings in the form and pinched them back mercilously. This method works best for simple shapes.
If neither of the above methods will work for you, you could simply train your geranium into a standard, lollipop shape. Just pinch off the lower leaves as it grows until it's as tall as you like, then pinch until you get a nice round ball (or two or three!) on top. Some geraniums will need to be staked.
Good luck, and thanks again,
Veronica