My numbers are probably exaggerated a bit but an old Mopar has between 5500-6500 spot welds depending on model and year. I drilled out anywhere from 3 to 8 cars a year. Enough that my hands and wrist are totally jacked up now to the point that I can't do that anymore and really don't know how much longer I can keep wrenching.
Here are the tools that I used. You can actually hammer through the welds with the Seam Busters. Works great from areas that a drill cut reach as such the seam between the firewall and floor pan. I had some that I put a curved in it so I could go around corners and reach in tighter spots. I didn't use any oil and only had to center punch the shallow and sloppy welds. Most of them I just zip zip zip right long. As stated before after a 100 or so you'll get the hung of it. I started with the cheap one and finally got the Blairs and it was like why did I wait so long? Things went so much better and faster. There are also some stitch welds here and there. Also have to keep in mind that I was removing pieces so that they could reused.
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