Flat panels need domed or flat hammer. Depends on what your doing. Flattening or stretching. The more curve you have in a hammer the more pressure it puts in the one area to stretch the metal.
Curved panels and Flat hammers make flat panels if you hit from the concave side. If your hammering the concave out you need a curved hammer to push the curve out and still keep the curve.
You can never have too many dollies. Alot of times we have to use a piece of tubing or the end of the vise to get that just right curve. Dollies give you a bunch of different radius's to hammer against.
Rodger
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