Prevent solder joints from flowing using Stop-Flow™ anti-flux liquid. This convenient pre-mixed liquid shields delicate filigree work, hinges and chains from solder flow. This non-toxic formula is precisely mixed for the best application. Works with all non-ferrous metals. Apply directly to previously soldered areas, hinges and moving parts with a soft brush. Easily removed with warm water before pickling. Effective at all temperature ranges. Non-toxic and biodegradable.