If it is just a dent you are trying to get rid of you can spray washing detergent on the dent heat the dent slowly until the detergent dries up and hit it with the cold water should have told you this first have a bucket of ice cold water ready.
Panel beating aluminium sheet.
You may have to do it a few time depending how bad the dent is.
Beating dents out of aluminium sheet.
The two magic tools for shrinking are practice and careful observation.
Planishing is the traditional term used for the process of smoothing a rough panel.
But none do any more than limit the stretch to some degree at the cost of beating up the work.
Stretching hot shrinking annealing.
When working with aluminium it must be remembered that it is a much softer material than steel and less force is therefore required to manipulate it.
Straightening tempered aluminum sheets key words.
Bag has 1 1 2 hole on one side with extra wide hook loop for filling and refilling.
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Some prefer to heat with the neutral torch flame and rub the panel with either a bar of soap or a stick of soft pine waiting for the material to char.
First i coated it with soot.
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The panel can be stretched again imagining a wedge shape by beating out from the tip of the wedge and gradually increasing the width of the beaten area and the force of the blows up to the panel edge.
Any way this can be done to in effect shrink the dented part back to the original size.
At that point the temperature is somewhere around 650f.
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Double stitched with heavy duty thread and seam covered with nylon binding to prevent leaks.