Just a £1.50 paint stripper from wilkos and a little wire brush. It’s not strong stuff. You put it on thick and a little paint bubbles after a couple hours. Brush that off, rinse with water, repeat. Took a couple days of coming back and doing 4 or 5 repeats
What did you use to strip the frame? I have a couple I need to do and Nitromors is like baby formula these days.