NC217 Gel Flux is specifically designed for touch-up and repair work. NC217 has a gel-like consistency minimizing spreading during rework and improving heat transfer from the soldering iron tip or hot air source. NC217 provides a much wider process window than liquid flux and lower residue than tacky flux. Gel flux spreading beyond the heated rework area, once dry, passes J-STD-004A/B/C unheated. NC217 dries within one hour of use with or without heat and is tack-free after four hours.