Progress Thread Prime's 87 T-top Gt

Welp, I suck at welding. Haha. It looks like I need more heat. One hole actually got filled. 3 of them look like I didn't touch them and the others are kinda full but not enough. Sprayed with some weld through primer so I can see better. Time to try again.
 
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Free welder was free. I need to get a bottle/regulator.

I’ve got no issues with Flux core other than it’s ugly lol. I was just going to recommend cranking the heat up
 
Opinions?

I'm thinking about installing rivnuts with Loctite on the screws to hold the solenoids, charcoal can, & ABS pump. Seems like a better option than just putting bolts into the metal. Obviously, the solenoids and charcoal can don't weigh anything, but it'll make for serviceability should the need arise without risking over tightening and stressing the metal. I'm concerned about the weight of the ABS pump. But maybe a tack weld around the rivnut will alleviate that concern.