Rust effect has 2 components: component "A" (powdered iron 300 gram) and component "B" (reagent 80 ml.). Spread some component "A" on top of or mix with any Stamperia paste (plaster, soft paste, etc...), then pour a few drops of reagent "B" on top of the mixture. The more reagent "B" you use, the more the rust effect. Reacting time 24 hours. Rinse brushes with water after use.