In case it helps, here is what I used for dipping my pedals, including a video link. Worked great, but I couldn't speak to how well it would hold up on an underbody part like your lower control arms.
I used the float method because I don't have the room in my garage or volume of parts to restore to justify keeping a large bin around. Floating limits you to oil based paints. I used Rust-Oleum Semi-gloss black 7798 because after dip coating test panels, that seemed to match the pedal paint better then the satin gloss. Mixed it 5:1 with acetone because that seemed enough thinning to reduce the heavy bead that forms on the bottom with straight paint.
Overall process: Degrease -> steel wool -> soak in Evaporust -> rinse, dry, wipe with clean towel -> scuff with maroon Scotch Brite -> dip in semi gloss black mixture -> after a week of drying, coated the bare metal part with Boeshield T9
-the steel wool removed the top of the rust and accelerated the process in the Evaporust without leaving scuff/scratch marks on the parts to remain bare.
-I used the maroon scotch brite because it could get into the tiny spots and around weld material. Supplemented with sand paper on the flats where I could. In the video I forgot to scuff the first pedal and paid for it, but corrected my mistake for the second pedal.
Any feedback how to do it better is welcome.
You can fast forward the first 1min if you get bored watching me carefully pouring the paint on top. The acrylic vase is great for making a video, but not for keeping a dipping tank. The paint is attracted to the high polarity of the acrylic and after 1-2 hours started creeping down the sides. Better to use a polypropylene or polyethylene container like most of the storage bins you find at the hardware store. I didn't post here originally because I am a rookie and not a concours expert.