Thanks guys, message received - 110v spot welder is a no-go. That also explains why first word at the counter was there was a 20% restocking fee if it was returned.

I did test spot welds on fresh clean sheets of metal scrap pieces - clean and one single path for current to flow is definitely different.

I did MIG rosettes on the trunk pan, I got the spot welder for cleaner welds on the outside body panels.

Looks like good MIG spot weld tips from Eastwood: https://youtu.be/QN9Y9tc7gCs?t=637
Or TIG spot welds: https://youtu.be/3-LSuFsqoWc?t=29

Current:'70 Barracuda 383 Gran Coupe project,
Past highlights: Datsun roadster/Olds V8, Porsche 924/buick V6, '89 IROC-Z, '00 Vette/procharged LS3, ML63, 335i, 914, 944T, '39 LaSalle sedan project