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Glue a patch on the inside - patch possibly made from part of a beer can (zinc sheet might be better?), generous amount of JB weld, covering well beyond the damaged area. Surface prep may be necessary depending on how corroded the steel is, but it won't be seen if you do it on the inside.
Even an inner tube patch would probably work temporarily - again, on the inside so pressure is holding the patch in place.
I have a painted tin watering can which has a small hole in it (see bottom right of can in pic).
I don't really want to throw it away, is there a relatively easy way to fix it?
Bodges welcomed.
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