Prip's Flux 32 oz (store pick-up only). Prip's Flux is a fire scale preventative. It will not always prevent fire scale – but, it helps a bunch. Prip's flux is named after Jack Prip aka John Axel Prip (1922 – 2009), who was a jewelry instructor at the University of Rochester. This item is considered hazardous/flammable for shipping - it is only available for "store pick-up."