How do I prepare the surface for trace repair?

For optimal adhesion to most surfaces, clean the repair area prior to ink application. That insures the surface is free of oil, greases and handling soils. For precise cleaning just around the rework area, Chemtronics offers CircuitWorks Flux Remover Pens, which contain fast evaporating cleaning solvents. Chempad (#CP400) isopropyl alcohol (IPA) presaturated wipes and Chemswab (#CP25) IPA presaturated swabs are also well suited for surface prep.