One done was with the HF unit, one was with the 250AMP Craftsman manual charger the gold color ones, and the other was with the medical grade 24V 12.5 AMP inverter power supply from ebay cost $20.
these were older style Peerless radiators or something. Pic 2 shows 3 radiators treated with TSP after they were de-rusted and 50+ yrs of chrome colored heat resistant paint removed.
1st one looked really nasty bagged a jug full of sediments. Pic 1 shows one is being derust / paint removal after the 2nd water change. If you still insist on getting a automatic smart charger only, I think some one in youtube have use a large battery to buffer with the automatic charger hooked up. I have always default to my 10 yr old Vector smart charger (now black*dacker smart charger think they acquired Vector) for charging and topping off batteries. I used it to charge battery maybe once or twice when I can't find the automatic smart chargers. worked good for paint / rust removal on my radiators. But as far as price wise even if you bought surplus parts, still can't beat that $29.99 coupon price at HF + $5 fuse replacement.
It really don't needed any high end Voltage limiting / Current limiting lab precision power supply for de-rust or paint removal, good to have if you have $$$. Maybe you just reuse that transformer inside your crappy charger to make your own simple unregulated DC power supply for electrolysis.
