Using lead to fill trim holes

I have managed to do this recently for rust pin hole repair on a vertical window channel. .
If I can, anyone can.
Metal must be clean, as stated.
There is a fine line between runny and soft enough to push into the area.
It's tricky.
If you don't have too much to do, this is economical.
It is what I used.
http://hardwaredistributors.com/solder-50-50-solid-wire.html?gclid=CL2HmvLPkMcCFdgUgQodBFsMTA
You can get it at your local ace.
Even if you weld it, like I did in some areas, lead could still be used.
Use a P100 HEPA to finish.
Lead= bad stuff.
http://www.pksafety.com/parfil.html?gclid=CJD8kcbQkMcCFUgWHwodWvIDKw