can i use a 90amp flux wire welder mig 100 to repair the side of my truck bed

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Flux core wire and sheet metal repair is typically not a good combo for getting a nice, clean, solid joint.

If you could run .023” and shielding gas, I would go that route long before trying to screw around with body work and flux core wire.
What Poser said. I hate flux core wire. Brittle. Messy. Slag. Nothing to love.

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