This is a heavy liquid flux by Glastar which is easy to apply, stays without running, and cleans up in a flash. Rinses off with water and is free of unpleasant fumes. Creates a uniform solder bead that stays put and does not corrode copper foil or discolor lead. 4oz. HELPFUL HINT: NEVER use too much flux! Excess flux trapped in your solder seams will corrode your solder from the inside out, leaving a white, powdery residue. It doesn't matter how often you scrape this corrosion, it always returns because the flux is INSIDE the solder bead.

• Glastar Glasflux 4 oz Thick Solder Flux No Fumes

Glastar Glasflux 4 oz Thick Solder Flux No FumesGlastar