Ball peen hammer while somebody holds a small hand-held anvil on the
other side of the dent. Just like body shops used to do 20-30 years ago.
You may even still be able to find the tools at an auto-body supply
house. Unless you are a natural at it, it'll probably looks worse when
you are done, and you will probably need to putty and paint some anyway.
It's a shed. It is supposed to look well-used.
I've taken dents out of a few metal garage doors (don't ask). Best approach
I've found is to go slowly and try to reverse the process that caused the
I.e. try to "un dent" it starting with the part of the dent that was caused
Similar to the approach you'd use with a dent in a car. Won't ever be
but with care (and a not too large dent) can be made pretty good.
Can you use a suction cup?
Or how about dry ice?
Another may be hot glue on the end of a flat object.
"My friends, we live in the greatest nation in the history of the
world. I hope you'll join with me as we try to change it." -- Barack
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