Here you can see how it started out with the new ring welded in place and ground down. Notice how the profile of the fender and new ring are not continuous. The lead will provide a smooth transition between the two.
Here are the tools used.
Flux - used to prep the surface and give something for the lead to stick to.
Paddles - Used to shape the lead and move it around. The paddles are dipped in wax to keep the lead from sticking to the wood.
Lead - This is the actual lead which is technically an 80/20 mix of lead and tin.
First step is to heat up the surface and with the flux brushed on.
Next is "tinning" the surface with a small amount of lead. Since the surace is warm the lead will melt on contact and once a small amount is acquired you rub the lead into the surface with a rag to embed the lead.
Once the surface is properly tinned it's just a matter of melting the lead and spreading it with the paddles to the desired shape. This is much akin to frosting a cake.
Then you use a body file to smooth out surface and remove any areas of high build.
When the process is complete you have a smooth uniform surface.
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