When using the shrink wrap modifier it seems to be squashing the mesh as it goes round the corner of the object I'm trying to fit it to. Is there any way to deform the mesh evenly without this 'squashing'?
.. But why not just make some temporary edges in your tin, and make your label by duplicating some faces and separating to a new object? It Uunwraps cleanly, if you keep the aspect ratio, and can be scaled to your image?