Kester 83-1000-0186 Flux-Pen 186 Clear Mildly Activated Rosin Flux - 10 mL Pen at SkyGeek.com
Flux - mini marker 3 mm | Overkill
FLUX COLOR
Chemtronics CW9100 No Clean Flux Remover Pen, 9 g
UNFADE.dk - 🌚 FLUX Classic shoe polish mop filled with black FLUX FX.INK. The round tip leaves thick creamy lines, and you can squeeze the body of the marker to get even