Agree with the above replies. I have a 20 year old HF flux core welder that’s done a lot of good work. Now I only use it for dirty metal, farm type repairs outside when it’s windy. Every thing else gets a gas shelded Lincoln 175 amp welder. Big stuff, break out the old Honda powered stick welder.
Given a choice, I would not use a flux core machine for bodywork.
RonR