Trying to weld, I’m terrible!

ESP47 said
I've also never been able to use weld thru primer on the backside of anything I've been welding. I can watch people on youtube use it all day long but it is like straight up weld repellant when I try to use it. My welder acts as if it's trying to weld through motor oil if there is weld thru primer on the backside.
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The weld through primers are not all created equally. I had really crappy luck with the Napa brand zinc weld-thru. But much better with a copper-based one from another manufacture, as well as the zinc type from another manufacture. It’s not cheap but you could try a different type.