Facilitates re-tinning of irons as rosin solder does not need to be used and rosin corrodes the tip. Solder, clean, use this product, install in the bracket. If you want to re-solder, just clean it up, add fresh solder and go. It almost doesn't smell and I don't find the resulting smell very unpleasant. The product is very small and filled to the brim with solids. It should take a while though, since you'll be using very little of it each time you can.