Metal toothpaste and mustard tubes for wagon sheets

Having had a recommendation from one of the noted wagon builders within our hobby I tracked down some 'Euthymol' toothpaste (available at Superdrug) in metal tubes. Cutting off the rolled tube bottom and slicing along its length allowed me use a spatula to remove and discard the toothpaste without deforming the malleable metal of the tube unduly. We also have a Colmans mustard tube which appears to be made of the same material. It should be possible to get two clay open wagon sheets from the metal of each tube. It does seem ideal for the job.